The Triquetra looks nice, but I don’t know that I would use anything but the Z probe. Once you have a touch plate, it is very easy to use in UGS. I learned from the following video:
Clip one aligator clip to the bit and the other to your touch plate.
Set tool height about 1/4" above probe surface on top of the material you are going to cut.
issue command G38.2 Z- .5 F1 (probe down .5 inch at 1 inch per minute). Probe should stop as soon as contact is made with the touch plate.
Once the probe stops, enter command G92 Z .065 (or whatever the thickness of the touch plate is). This sets the current Z position to .065, so the work position will be exactly at zero.
That is all there is. I made a macro in UGS for each command, so setting Z is easy. Remember to remove the clip from the bit before starting the router!