Some months ago I decided to move every little things running on some VPS to docker (so I could move those apps at will and have apps with incompatible dependencies running on the same VPS).
I looked into Haproxy, set a bunch of rules and fall into static IP management hell. Then I tried Traefik mainly because of the HTTPS auto-renewal feature but the ability to tag docker containers with DNS regex (so traefik knows how to reverse proxy traffic) is a god send.
Is there something like that in HaProxy 2.0 (HTTPS auto-renewal and container tagging) ?
I would check out https://github.com/caprover/caprover. You can run multiple apps on 1 VPS and HTTPS renewal is automatic.