Here is the mount that I used. I looked for a less expensive one but a wall mount is expensive! If I could have done a flush mount they are much cheaper.
Here is a picture with the snap mount cover off. I had three switches there that are now Hue lights and a fan control that I control with Hubitat so I don’t need the physical switches anymore.
I soldered wire to a 5V small apple charger and then connected it up to AC in the box. I used heatshrink tubing around the charger plugs to insulate them from shorting out on something else. I’m positive that wouldn’t pass building code but with such a small usb charger, I’m not worried about heat or anything.
Hope that helps!