why not build your own much more flexible. shouldn’t be very hard. just get a battery like this one www.amazon.com/…/B094NN5KWY and an inverter.
i have had terrible experiences with these all in one UPSs that you mentioned, battery degrades fast and starts lasting only a fraction of the time. i would suggest getting a killawatt to measure power consumption, gives you a much better idea of what capacity inverter you need.