Cyberpower 1500 AVR for me. Router, WiFi, and server run off of it. It has kept me going on the internet during power outages as well as ding voltage correction when we have under or overvolt power moments. And I use the cyberpower Linux app they provide to set server shut down time based on battery level. It has saved my equipment a few times. We have occasional wind induced power failures here (overhead power lines) and had a crow land on a transformer and explode which immediately triggered the UPS to clean the sudden blip. Also had an HP laptop power charger fuse itself internally and UPS detected the short and shut down all power. Without that UPS, the pack might have overheated if the panel breaker didn’t sense the short.