That example shows how to add 2 filters
// array of filters (field key => field name)
$GLOBALS['my_query_filters'] = array(
'field_1' => 'city',
'field_2' => 'bedrooms'
);
My understanding of this code is that you just need to add more fields to this list to add additional filters. It may requires modifying code for each filter depending on what field type the acf field is. For an overview on the correct meta query for different fields types https://www.advancedcustomfields.com/resources/query-posts-custom-fields/
