Hi!
1. You could either use a search widget, or the shortcode within the results page. Some page builders allow adding a shortcode block there, for other themes you might have to edit the search.php file in the child theme/theme directory. In that case the PHP version of the shortcode must be used.
Once you have that in place, make sure to enable the search override, and it will pass the results and the option states to the results page. That’s it 🙂