Large Range 4G Hotspot w/2.4Ghz Wifi for Mint Suggestions?

I'm having to move for a job and am keeping the house I'm moving from for at least a year. Want to set up a wifi hotspot that had a large range so I can keep some security cameras running even if the power goes out.

Saw a lot of suggestions for hot spots but want to find one that someone's tried in a medium sized house (2-3 br, multiple levels) that has 2.4 Ghz wifi for my doorbell/security cameras to connect to. Trying to avoid buying one that doesn't have good range and having to buy/return a lot of different hotspots.

Thanks in advance for any tips!