It may be easier/more convenient to just attach a laser pointer somewhere on the router mount, measure the X/Y offset from the laser to the center of the router axis, and use a gcode command to shift by that offset.
Example here: Laser XY zeroing
It may be easier/more convenient to just attach a laser pointer somewhere on the router mount, measure the X/Y offset from the laser to the center of the router axis, and use a gcode command to shift by that offset.
Example here: Laser XY zeroing