Hi,
Results page customization is not possible via a plugin – the results page layout is controlled by the theme you are using. Some themes may offer support with page builder plugins, but usually the best option is to custom code the changes you need via a child theme.
The linked API script is best used in your browser developer console.
Basically, you change the search options as you need them, then run that command with the correct search ID, and it will print the URL to the console. The search ID can be found here. For example, if your search ID is 5, you enter this to the console:
ASP.api(5, 'getStateURL')