I do have a 4k tv, and a 1080p one. But personally I don’t see big difference on 720p vs 1080p vs 4k. I have to be like 4 feet from the tv to notice it. 720p is sufficient.

Anchor point for assembly

I have a similar setup. I have an old laptop with an SSD that puts files on my NAS. The laptop has arr setup on containers, the laptop itself is running debian, mounts from Samba NAS via fstab (be sure to have writing permissions) has been working that way for several years.
Only direct plays, no transcoding (core 2 procesor)

Two factors, quality and heat. If you buy bad quality they will last a short time. If the fixture is not designed to dissipate heat it will last less time. I found out the last one for a couple of mine. The ceiling lights with a shade kinda of a bowl like. The LEDs ones lasted less than a year. Then one of them I didn’t find the nut for it and put some other one that didn’t fit quite well but let the air flow and that one outlasted the other ones. Yes heat will kill your LEDs.

Kylie Minogue - come into my wolrd