I have grbl mega up and running on my primo. I have my touch plate connected to the z min, and I can home z and everything works fine. Ultimately, what I want it to do is raise to a predetermined height after homing that is the appropriate focus height for the laser. I “think” z home is really intended for end stops, so the touch plate probably makes more sense for probing, and I could set the thickness of the touch plate to be larger than it really is to get the laser to the correct focus height.
Does this make sense? Any suggestions on which way to go, or alternate suggestions?