I have an Orico device that is connected by USB 3. It holds five disks. It gets recognised at boot time but goes to sleep. A background task that accesses it every 10 minutes has fixed that.
I have a couple of e-SATA boxes that hold four disks each. I have a NAS but it has a habit of picking up malware.
SAS disks can be had fairly cheaply so I'm investigating that. I bought a second-hand HP microserver and found that they have both SATA and SAS ports.