My thought of using a UPS is not really for surge, but what happens after the surge (brownout dips) that you need to really be adding power to the line. The only method to do that is via some form of battery.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5