Yes, my camera plugin might help with this problem. You have to decide on the center of your workpiece. But wherever that is, you draw a mark on the center. What Paper Tools will do is then move your router over the square, it uses computer vision to find it and I’ve gotten repeatability of +/-0.002. Then you can zero your machine over that square and begin your cut.
Here’s a post that talks more about it:
https://forum.avidcnc.com/t/mach4-plugin-try-out-my-visual-cnc-plugin-and-give-feedback/1990