UPS with power outage signal capability

Hello everybody. I’m currently building my own observatory (roll off roof).
I’m considering the purchase of a UPS . Which requirements should it have for raising an emergency exit to Voyager in case of a power outage?
Consider that I’m using a mini PC on the telescope and that I would like to avoid possible USB cables hanging on this route. Thanks!

You need an ups with a relays out to signal no power or problems. Others users of voyager and viking already do this, or simple use a power dc attached out of ups circuit that have a 12v out to connect to an I/O card digital input. If you have 0 volt this mean no power but ups running