It's very much a new and barely tested feature (just arrived in 8.0.1-BETA3), however my assumption would be a UPS that worked in FN7 stands a very good chance of working in FN8, but since this feature is so new it might be worth waiting a little longer.
In my case an APC BF500 worked fine with FN7, can't test with 8.0.1-BETA3 as I need network UPS support and email notifications are not working for me any more (googlemail account).