Cambrionix ThunderSync is what was recommended to us by Apple to use with Apple Silicon Macs, however so far we've just taken a dozen or 15 or so M1 machines from our inventory with just a local user account created is all and installed Configurator 2 and DFU Blaster on one, performed a single DFU wipe, then AirDropped and placed in the correct locations the Configurator and DFU Blaster apps and the ipsw download from the first machine to the rest so the first run doesn't take so long on them.
So far we haven't had need for a USB hub, by the time you get the last machine out, plugged in, opened, DFU'd, and restoring you're likely almost finishing at the beginning and ready to start swapping for the next machine. If we didn't have the availability of extra devices to run Configurator on or needed to do restore many at once vs systematically down a table of machines I could see the benefit in running a hub. Also the hub would have the benefit of charging the devices, too.
You would be able to use your ThunderSync 16 with Macs if you had USB A to C cables, wouldn't you? With the cost of the hubs being what it is, using your existing 16 and getting some extra sync cables would probably be the cheapest option.
