Wireguard - Site to Site and User access

Hi all,

I have two router working with wireguard with a site to site VPN. But I was wandering if I could join a config to deal with users using wireguard.
If so how can I do it? Creating other interface? Using the same interface but using another peer?

What's your opinion?

This should work.

That's normally redundant, but can work as well.