I hope I'm posting in the right forum here, otherwise please accept my apology.
I'm new to building ROMs. Currently I'm playing with the HiMedia Q30, don't like their firmware and would like to replace it. At first with alternative ROMs, then with my own build.
I wanted to try SlimRoms, CopperheadOS and LineageOS, but it looks like they're optimized for phones. Even the Oreo builds from the Android website are for phones.
1. Do the mentioned ROMs work on any device?
1.1 If so, why are they optimized for different models?
2. Can you recommend a ROM for TV boxes?
3. Is there any general Android (preferably 7+) build that works on any device?
I appreciate your help. Thank you.