The installation of the agent is not provider related i.e. you can install the agent (the software you will install on each of your two PCs) and let the software run.
If one computer is connected to Verizon 5G and the other one is connected to T-Mobile you simply have to check how many outages were accounted to each agent and you will know which is best for you.
Otherwise, if you can have only one provider at a time for both computers then you can let the agent collect as much data as possible (let's say for one week) and check how many outages were collected; then you can RESET the agent's data (you will loose that historical info) and connect to the other provider to test it the same way you did it before