The grid of holes in the MFT's are lined up in a perfectly square pattern. Using dogs, you can place fences, whether Festool or home made using straight lumber cut to any appropriate sizes/lengths, you can clamp so to have 1 sq corner to 4 or more sq corners. I clamp the pieces down using the Festoy clamps and use the "frame" to do my project corners. Sometimes, I use the set up to drill my pocket holes as well as clamp the project corners for assembly.
Tinker