User-filterable form with multi-region array

I'm creating a user-filterable form with a multi-region array. The form is on a separate page to where the content regions are, but I've specified a page path to cover this. The regions are 'Development' and 'Properties' (Properties being a multi-item region), but only one of the filters in the form works so far (Property Type) and the results themselves are only outputting content from the 'Properties' region and not the 'Development' region as well.

This is my form code:

            <perch:form id="property_filter" method="get" class="form-horizontal">
              <div class="form-group">
                <perch:label for="min_price" class="col-sm-3 col-md-2 control-label">Min Price</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="min_price" class="form-control input-sm" options="No min|0,£100,000|100000,£125,000|125000,£150,000|150000,£200,000|200000,£250,000|250000,£300,000|300000,£350,000|350000,£400,000|400000,£450,000|450000,£500,000|500000" />
                </div>
                <perch:label for="max_price" class="col-sm-3 col-md-2 control-label">Max Price</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="max_price" class="form-control input-sm" options="No max|999999,£500,000|500000,£450,000|450000,£400,000|400000,£350,000|350000,£300,000|300000,£250,000|250000,£200,000|200000,£150,000|150000,£125,000|125000,£100,000|100000" />
                </div>
              </div>
              <div class="form-group">
                <perch:label for="min_beds" class="col-sm-3 col-md-2 control-label">Min Bedrooms</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="min_beds" class="form-control input-sm" options="No min|0,1,2,3,4,5" />
                </div>
                <perch:label for="max_beds" class="col-sm-3 col-md-2 control-label">Max Bedrooms</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="max_beds" class="form-control input-sm" options="No max|99,5,4,3,2,1" />
                </div>
              </div>
              <div class="form-group">
                <perch:label for="property_type" class="col-sm-3 col-md-2 control-label">Property Type</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="property_type" class="form-control input-sm" options="All|0,Apartment,Detached,Semi-detached,Mid Terrace,End Terrace,Town House,Bungalow" />
                </div>
                <perch:label for="property_location" class="col-sm-3 col-md-2 control-label">Location</perch:label>
                <div class="col-sm-3 col-md-4">
                  <perch:input type="select" id="property_location" class="form-control input-sm" options="All|0,Sunderland" />
                </div>
              </div>
              <div class="form-group">
                <div class="col-sm-offset-3 col-md-offset-2 col-sm-10">
                  <perch:input type="submit" value="Search" class="btn btn-primary" />
                </div>
              </div>
            </perch:form>

And this is the code used in the filter page:

            <?php
                perch_form('_property_filter.html');
            ?>

        <?php
        // Create an empty array ready to add our filters to
        $filters = array();

        if (perch_get('min_price')) {
            // if 'min_price' is on the URL, add a filter for min price
            $filters[] = array(
                'filter' => 'property_details_price',
                'match'  => 'gte',
                'value'  => perch_get('min_price'),
            );
        }

        if (perch_get('max_price')) {
            // if 'max_price' is on the URL, add a filter for max price
            $filters[] = array(
                'filter' => 'property_details_price',
                'match'  => 'lte',
                'value'  => perch_get('max_price'),
            );
        }

        if (perch_get('min_beds')) {
            // if 'min_beds' is on the URL, add a filter for min bedrooms
            $filters[] = array(
                'filter' => 'property_details_bedrooms',
                'match'  => 'gte',
                'value'  => perch_get('min_beds'),
            );
        }

        if (perch_get('max_beds')) {
            // if 'max_beds' is on the URL, add a filter for max bedrooms
            $filters[] = array(
                'filter' => 'property_details_bedrooms',
                'match'  => 'lte',
                'value'  => perch_get('max_beds'),
            );
        }

        if (perch_get('property_type')) {
            // if 'property_type' is on the URL, add a filter for property type
            $filters[] = array(
                'filter' => 'property_details_type',
                'match'  => 'eq',
                'value'  => perch_get('property_type'),
            );
        }

        if (perch_get('property_location')) {
            // if 'location' is on the URL, add a filter for location
            $filters[] = array(
                'filter' => 'development_details_address_city',
                'match'  => 'eq',
                'value'  => perch_get('property_location'),
            );
        }

        // Add property status to filters
        $filters[] = array(
            'filter' => 'property_status',
            'match'  => 'neq',
            'value'  => 'sold',
        );

        // If no filters are set, return this
        if (!count($filters)) {

        perch_content_custom(array('Properties','Development'), array(
            'page'=>'/developments/*',
            'template'=>'search/_properties.html',
            'filter'=>'property_status',
            'match'=>'neq',
            'value'=>'sold',
            'sort'=>'property_details_price',
            'sort-order'=>'DESC',
            'paginate'=>'true',
            'count'=>'15',
        ));

        }

        else {

        // If filters are set, return this
        perch_content_custom(array('Properties','Development'), array(
            'page'       => '/developments/*',
            'template'   => 'search/_properties.html',
            'sort'       => 'property_details_price', 
            'sort-order' => 'DESC',
            'paginate'   => 'true',
            'count'      => '15',
            'filter'     => $filters,
        ));

        }

        ?>

So my questions are:

1. How can I filter by both regions?
2. How can I filter between values with perch_get if it's part of a filter array? e.g.:

        if (perch_get(array('min_price','max_price'))) {
            $filters[] = array(
                'filter' => 'property_details_price',
                'match'  => 'eqbetween',
                'value'  => perch_get('min_price'),perch_get('max_price')
            );
        }