I’ve tried a few “third party” smart bulbs as it were but, expensive as they are, nothing comes close to Hue for colour accuracy and general responsiveness. As you didn’t specify “cheap”, Hue will always be my recommendation.
That said, if you do want “cheap” and want to avoid WiFi then the Innr bulbs are fairly decent for the price. I’ve got about 15 of their spotlight style bulbs and they were half the price of the Hue alternatives.
I’ll have to have a look when I’m next in the vacinity but I’m pretty sure I have an APC Easy UPS on mine and it works out of the box.
Let me get back to you…
Update: It’s an APC Back-UPS 850. No doubt the instructions banged on about requiring Powerchute but I just plugged it into the Syno and it worked fine. You do need to enable UPS support on the NAS itself of course, from Control Panel/Hardware & Power/UPS, and set it to USB UPS.