I’m using a SuperMicro A2SDi-4C-HLN4F for my NAS.

It takes like 20-30W with 4 3.5" SATA HDDs and one M2 SSD installed. It has IPMI and I’m running it with FreeBSD 13.2, works like a charm. You just need to be aware that you need to adjust the SATA ports in the bios in order to use all 4 of them, by default only 2 SATA ports and the SAS interface will be enabled.

The temps are fine on the cpu without fan - I only have three fans in front of the drives.

I use INWX. Prices are very cheap and their DNS supports most of the record-types available, which I didn‘t have at some of the registrars I was at before.