@ingeborgdot 

From what i know about this solution the T Mobile uses a Sim Card inside a home router type device.   If that is the case then there is nothing stopping you disabling the WiFi on the T Mobile router and connecting it to the Omada Router and onwards.

In theory this should be no different from a standard router install.

  @Philbert Not a lot of people really know for sure it seems. Some have different ideas on this. I just need a definitive one before we go ahead and get something like this.