Hello,
While registering the RUT device in the RMS, all you need to do is select the device model type ( either RUT or TRB) and write the name of the device, its serial number and LAN MAC address and submit. RUTX11 is compatible with RMS platform, you should be able to register, please try it once again, and please make sure you have written correct mac address and serial number. Once submitted make the connection from the WebUI end as well( from menu system>setup wizard>RMS). If you are having any other issues please if you could describe for me to understand better.
Thank you