I was just pricing a UPS for home office use this week as we have frequent outages where I am but became a little stuck when I realized that to get a UPS that won't barf when my generators come online moments after an outage, I'd need a double-conversion UPS, which is $$$$. A little stuck for a reasonable home office option given this wrinkle.
I mean. Im using line interactive ones and have for 4-5 years.
I have to de-tune their sensitivity but they work.
But it does stress the CPU power supply caps a little more and shorten their life. But the caps on the board are fine, and havent had an equipment failure outside of a PSU...And ive run literal weeks on genny power.
But that stress is more due to Hz being at the threshold and artificial stepped sine wave i think. Voltage fluctuations when load kicks up certainly doesnt help.