Searxng has it’s own issues like scaling and getting good results. It can still be a good option.

Prebuilt like a traditional server? I personally use an orange pi and it’s pretty good. Just make sure to use the open source arm OS.

There is a docker container setup with automatic lets encrypt and proxy. Can search around for it.

I thought you could install as a docker container?

This is one-click install, easier for beginners / non-tech people.

No it’s an open-source service to host your audio.

I recommend an Orange pi 5 with Armbian installed. Raspberry pi is under powered and it’s a pain getting compatible software for the arch.