I don’t have easel pro so I don’t know what the gcode output looks like, but I have done 2 sided products. I employ a centerline and make the XY and Z zero’s at the end of the centerline on top of the material. I’d have two files and use a dremel v bit to find the exact point to make 0,0,0. Then when done, flip it over, and line up the v bit again to the same spot on the other side.