We've found what looks like an excellent price for a fully supported wireless data plan. However, you must have an ATT Wireless small business account to get it. Suspect there are many forum users that have small businesses.
AT&T Wireless Internet data plan-100GB
Look under Shop small business - INTERNET-Fixed Wireless
100GB of data per month plus nationwide calling
You can move the device, as long as you are in AT&T coverage.
The service also includes a voice telephone number with unlimited talk - just add a traditional corded phone. The LTE MODEM is the ZTE MF279. We added two Proxicast 5 dBi Omni-Directional Paddle antennas to the MODEM's two external antenna ports, and the service is good.
Our office (and trailer) are usually in a rural area with no DSL, cable, etc. Our choices have been LTE or satellite.
We have been using 100-150 GB/month, and this solves our wireless data as long as we stay below 200 GB/mon. Unlike the "unlimited" wireless plans, you will need to watch your usage to prevent costly additional usage fees = $25/10GB. However, there is no throttling.
We had been paying about $18/SIM/mon to Verizon for 15GB LTE data in a gateway. ($1.20/GB/mon) - and consuming 8 to 10 SIMs per month.
Before moving we checked with Verizon small business. They offered no equivalent plan.