Another data point for you:
I got a cheap dlink-320l (The L in important) which was great apart from very loud fan. I replaced this with a Noiseblocker BlackSilentFan XM2 (yes 12v is correct) and now it is great.
For example, the fan and drives spin down when no in use. Under use, with highest fan. It was quieter than the attached 2.5 inch usb drive!!
It sits in a slat doored cupboard in the corridor with next to the bedroom.
The web-setup is a bit of a pain, but Im using it as shared drive, timemachine backup and media server.
The mediaserver isn’t the greatest. I was going to re-flash it with debian, but it’s just too useful. Maybe I’ll get a second to play with.
Cheap as chips on amazon….