I should look into that to see if I can restrict Vaultwarden, since I VPN into my home network anyway.

By reputation I know that Nginx proxy manager seems to work great if you’re on the “happy path” but if you need anything out of the norm it supposedly is less great to use. In my case I do have a few quirks, primarily with fcgiwrap. But I can’t say how it’d play, because I honestly never heard of NPM until yesterday when I was refreshing myself on web servers (and went with Caddy).