Hi, I read a lot about using a UPS for a stereo and signed up to this forum in order to join in the interesting topic.
A UPS should be avoided on any hi-fi equipment at all costs. The impedance/voltage drop of UPS’s is really bad for high peak current or high inrush current. A surge protector does however make sense probably.
Luckily, I live in Denmark. We have some of the most stable AC mains in the world. There is about 20 minutes of power outage on average per year. That does not mean every year necessarily, because I have merely experienced a few 1-hour power outages during my whole life.
You can also read my more detailed reply here:
Thanks for this wonderful forum.