HomeRunner provides default templates for two pages: the single property page and the property archive. You can replace either one with a template from your own theme.
Theme override. Both templates follow the standard WordPress override pattern. Add single-property.php or archive-property.php to your theme, and the theme copy takes precedence over the plugin template.
Turning the plugin template off. A plugin setting can also turn the plugin template off entirely. Your property page is then composed from individual shortcodes in your own template.