Amazon.com: CSG m106 LTE Gateway Router, Verizon 4G LTE Router, Built-in Failover and Hours of Backup Battery Power : Electronics
Amazon.com: NETGEAR 4G LTE Broadband Modem - Use LTE as Backup Internet Connection, Unlocked, Works with Any Mobile Network Provider (LB2120) : Electronics
4G-AC68U|Modem Routers|ASUS Global
Cheap and Easy 4G Backup Network : r/homelab
Mikrotik wAP ac 4G kit dual band access point dual concurrent wired router with LTE backup outdoor