I purchased a Pepwave MAX Transit Cat 18 router and a MobileMark 7-in-1 5G Antenna. While this can house up to 2 SIM cards, I am running just one at the moment. I got a T-Mobile 100GB data plan for hotspots & routers. After testing it, which was very easy to set up. I got this router package from www.mobilemusthave.com and their videos on installing it made it simple and super easy.
I did a Speedtest on both my computer and smartphone, I was getting about 27 Mbps down and 15 Mbps up, this is awesome and while I only have one SIM in the unit, I could add another, and then the router would pick the fastest connection as I travel around. So far this is have been a very good experience.