Are multiple routers under a single endpoint possible?

You would forward from the parent router to a child router. So you would still have a single router plug in endpoint.ex, but it would be able to forward requests to another router plug inside itself.

Thanks, that did the trick.

I think you can find this post very interesting

The reason why forward is not good (from the doc) option

Note, however, that we don’t advise forwarding to another
endpoint. The reason is that plugs defined by your app
and the forwarded endpoint would be invoked twice, which
may lead to errors.

I didn’t suggest forwarding to an endpoint, but to a router. forward is perfectly fine there. match would do the same thing when used to forward to another endpoint.