Best SEO Practices for Reverse Proxy Pages

Hi all!
I have a client who we have used the href prefix option and installed a reverse proxy for their webpage

Here is the read-only link:

We have multiple pages that have 2 addresses that link to one page. I was curious if the two URLs for one page would cause issues with SEO. If so, would it be better to do a Canological url or a 301 redirect? We need to keep the two pages because webflow needs to be hosted on one domain, then we are pointing the subfolder /p/ at that root domain. Or do you think it would be best to hide one of the URLs so that google doesn’t crawl it?

I hope this made sense, thank you for taking time to help!

I’d like an answer to this too.