I use an Advantech ICR-3241w-1N
Industrial cell data modem with WiFi in unit
I disabled my WiFi and run a Mesh WiFi network connected to cell data modem’s Ethernet port.
All 24 of my cameras run off that network and it will run cameras and internet without A.C. power for 2 days.
Yep, a tad bit of OverKill … LOL