Personally, I just have a couple of cheap CyberPower UPSs for my servers. I know I know, but I’m waiting for them to get old and die before I replace them with something better. My modem, router, and primary WiFi AP are on a custom LiFePO4-based UPS that I designed and built, because I felt like it. It’ll keep them running for around 10 hours, long past everything else in the house has shut down.