Mine sitting on a table in my home office does just fine with a set of 4x 10T drives (ST10000DM0004) and the fans run at a pretty slow speed most of the time. The drives from top to bottom are right now @ 36/39/39/37 C, the middle guys a little warmer of course. They have been ok for going on 1161 days so far in that same spot and were new when installed. Putting the SSD's in 2.5->3.5 sleds would let there be more airflow through the disk enclosure which is setup like a normal supermicro backplane.
The 2 side-mount points for 2.5" drives on the top & side of the cage area don't have as much airflow potential, but unless you put some hot SAS or NVMe drive there I doubt it would be a problem unless installed in a space that is hot to begin with.