It is possible to change the address if you want to keep it in router mode, it's just a bit of a faff in certain software versions do to bugs / faulty error checking.
Do you also have a WiFi router? If so, putting the hub into modem mode will place it out of the way on 192.168.100.1, but your WiFi router will get an internet address and be able to use anything else internally, so could happily sit on 192.168.2.1