I just wanted to see what other selfhosters backup emergency plan is if the primary internet router goes offline, leaving you without access to your stuff even via vpn.

the options I've considered so far:
1) cellular smart plug

I tried a ubibot smart plug (SP1) that is supposed to work with cellular, but the device or sim is bad. I'm currently troubleshooting. The problem with this one is it requires a proprietary cloud service, it's supposedly self hostable, but it's a pia to setup and their app port can't be changed easily allowing for a reverse proxy setup on VPS.

2) the other option I am considering is cellular wifi router and a wifi smart plug connected to that device.

what other options have I overlooked? Also, specific models of devices would be helpful info from others doing this already.

TIA!