Yeah, the reverse proxy thing is kind of annoying. It seems for the most part, you’d just need to access them through http://IP:PORT which I understand you’d probably not want to do. Haven’t really found a way around that but Ultra.cc supports Overseerr natively
HostingBy seems to have really good price, but I have heard that their support is lacking and if you want answers you’re better off asking in the discord for someone else to help you out.
Ultra recently introduced a Singapore option for some of their plans which I would definitely recommend if you’re located in Asia and you’re getting it as a media server. They also let you install pyenv (for Python versions), nodejs and golang so it’s easier for you to install your own apps. There are a lot of ways to compile your own apps, it just takes a bit of learning and time