Nice rack build @newb2.0 !
As for digital dimming, by which I take you mean a PWM dimmer with remote control, I am working with some controllers based on the Zigbee open source standard, but haven’t found one I can wholeheartedly recommend yet. When I do, we will offer it with a new strip we’re developing that will offer growers a whole new level of intensity and spectral control. Most DIY growers that have implemented digital dimmer controllers borrow from the aquarists’ toolkit of tank lighting controllers, but they are expensive ($200+) and less than optimal for our uses.
RE: 220v, the Mean Well drivers are set up to automatically switch to 220v operation, so you’d wire the AC side the same as any 220v appliance. I can’t say about the Sonoffs, you’d have to check the specifications. Small AC switches like that are often not capable of running 220v.