It’s mostly about casing though - density is important with enterprise stuff, and noise level is almost irrelevant hence small chassis with small, loud, fans.

I’ve got a 3.5” x16 bay gooxi chassis that I’ve put a supermicro mb + xeon in.

Something like this:

https://www.xcase.co.uk/collections/3u-rackmount-cases/produ...

I got this specific nas chassis because it got a fan wall with 3x120mm fans, not because I need bays.

With a few rather cool SSD’s for storage and quiet noctua fans it is barely a whisper.

Also - vertical rack mounting behind a closet door! I can have a massive chassis that basically takes no place at all. Can’t belive I didn’t figure that one out earlier...