I, personally, would avoid rack mount 1u/2u servers. I looked at them not too long ago. I could have gotten one free from work, but then I started to think on troubleshooting it when things went wrong, parts, mounting, noise, etc and I decided to pass on it. Yes free is free, but I have too many parts and cases I took home with me from work already. I built an ITX based system, running Unraid, in a silverstone sc381 case. Added some Noctua fans and it sits in one of the main rooms of my house, whisper quiet. If they want $200 and it contains working 2x10TB drives, then grab it for the memory and drives. Flip it for $50 to $100, potentially, on Marketplace.
I'm about to start looking at building another server for HexOS. And I'm looking at the Jonsbo N5. I'm hesitant because of the drive tray, or lack there of.