These are NAS (Network Attach Storage) which as with most NAS, it comes with their own OS. All NAS connect via ethernet cable. If you still want to use a NAS, a big requirement would depend on the number of concurrent users. As these are low end devices for home usage.
If you just want to use your router’s USB connection, then any external USB drive should be fine. However, on this case, the NAS capabilities will be provided by your router. You would have to check the router’s manufacturer and/or manual for your questions.
