I dreamed of diskless, got 6 2TB SSD in SATA form factor. They run hot. I wound up with a noctua fan for the disks, the zimablade is fanless passive cooling. And now with an ATX psu and a mini pc case I have a power supply fan, and got a 6 disk chassis which has very quiet fans built in. But it is quiet at least.
Seen some reports of people running into heat issues with them though if they run them full. So they end up using 3 out of 5 slots etc.