5 or 6 Bay Thunderbolt/USB-C DAS

[ed]

There are quite few options. There is no other DAS that allows different size drive mixing though.
Choosing a hardware RAID based box would achieve better speeds compared to software RAID. But it is a personal choice.
Our favourites are from Arica, Pegasus and maybe Netstor. https://www.areca.com.tw/products/thunde...050T3.html

I hope this helps.