Approved UPS products?

Following a series of power outages I’m looking for a suitable UPS to ensure Drobo, Mac, keep running.
I have Powerwall and Powerwall Gateway which within .5 secs takes over following power cuts, and eventually reconnects to Grid.
Have you carried out any testing with UPS products - i.e. any which may conflict?

I have APC 1500VA Smart UPS with SmartConnect work good.

Thank you - that’s very helpful!