dual 5g internet use

Bobcat2591…..

I’m using two boxes because of a bandwidth concern. So far reliable enough and only $60 p/month for both boxes. I’m also very limited where I have an acceptable signal. The current box locations are the only locations with at least a “good” signal. This spring and summer after the leaves are in full bloomwill prove if the signal will continue to be strong enough for usability. I have considered a signal booster, not a wifi booster. I don’t completely understand the concept though and that may be the most feasible option if signal boosters actually work. My only internet options are either T Mobile or Verizon. 
Thank you