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.
Framework 13 AMD running PopOS no issues. It’s great.
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.
Popos on the Framework laptop. It’s pretty good so far.
Searxng has it’s own issues like scaling and getting good results. It can still be a good option.