Dynamic router or endpoint scope host for SSL port 443 and multiple certs?

I am trying to work out how to have a Phoenix 1.4 app router.ex include different scopes to different hosts on port 443 using SSL.

I get the scope host domain working on say port 4000 (and I assume port 80) but I expect a roadblock when I go to 443 and SSL i.e. and needing to use different Certbot certs.

Checking source, I think scope is limited to host.

Should I make endpoint code that handles domains and multiple certs?

I guess my general question is, does scope host: work on SSL? or will I have limits set by certs?