Setting up a new home network which will consist of multiple devices hooked up through Ethernet. I will have my ISP provided modem into a Protectli Vault running PfSense into a UniFi Switch, powering about over a dozen power over Ethernet devices. I will also have an NVR to record security camera footage.

I am looking for a power supply, that can power my modem, firewall, switch, and NVR, that provides the usual protection, as well as provides a backup power source (battery) in case of a power outage. I would need said unit to kick in right away to prevent my devices from shutting off. Any recommendations?