4G LTE as a potential broadband alternative for a rural location

I have a non-profit client in a remote-ish area of California's Central Valley. They have been using an expensive fixed-wireless broadband service, but due to their location they can only get 6Mb service, which has been mostly reliable but slow. They used to use HughesNet satellite service, but that became impractical because of the daily usage caps which required tokens to be purchased frequently to restore service. There were also issues with NAT and port forwarding. In the past year Frontier DSL has arrived in the area, so now they have both services with a load-balancing router to increase both overall bandwidth and reliability. However, internet usage can be up to 8 people concurrently, so I'm looking at the NetGear LB1120 4G LTE modem to do better than 6Mb via cell service. Cell service at the client used to be good with Verizon, but has significantly deteriorated in the past year or so. AT&T and T-Mobile are also not great (2-3 bars for most services). No idea if/when 5G will be available there. The LB1120 may or may not work with Verizon apparently (I'm guessing due to band availability in the area). Can anyone share any experience pro/con using cell service as a broadband alternative in general or with the NetGear LB1120 in particular? Thanks.