on Mar 8, 2018 at 4:09:18 am Last Edited By Tim Jones on Mar 8, 2018 at 4:09:56 am
While it's a bit more expensive, by investing in a true SAS solution that is connected via TB adapter, you will have far more options moving forward. One good recommendation would be a combination of the Sonnet Tech SE-I Thunderbolt 3 to PCIe chassis. This allows you to install 2 PCIe HBAs. The result would give you the ability to add a true SAS HBA like the ATTO R680 or the HighPoint RocketRAID 4522 and later add a 10GbE network adapter.
You could then use anyone's SAS tower to hold and power your disks - we like the SANS Digital TR4X and TR8X units. These are cost effective, quiet, reliable (we have 2 that are over 8 years old), and can support any 3.5" SATA/SAS disk out there. You could load a TR4X with four 12TB and end up with 32TB of RAID-5 capacity. Here are some non-affiliate links so you can get an idea of the costs.