Cudy AC1200 Cellular Modem/Router with WiFi

So, keep in mind due to T-Mobile's CGNAT you will NOT be able to initiate an outside to inside remote connection due to the firewall rules and port blocking. If you keep the Team Viewer session standing with an external destination it might be a solution but I sort of guess maybe not. It is hard to say for sure until it is tested. I worked for HPE for 22 years as a network escalation engineer for enterprise customers so I might tend to imagine possible issues. I consider the variables. I dont know how long a Teams viewer session can be left open. I think it might be a challenge.

I have no experience with AT&T's cellular internet solution. It was not an option in our location here. Our options were HughesNet (no way) or T-Mobile and the cellular solution. One thing you might look into is to connect into their community forum and get some feedback. You could look at the major topics and do some searching to see if their customers are any more satisfied. Reddit would be another source where you could get some info. Ah yes and there is Nater Tater and his YouTube videos. Maybe he has done some investigations with their gear. I am not sure. 

If they would delay the scheduled move I still feel that would be a better KNOWN solution with a much greater chance of success. I do understand the situation.