I installed the readout at the base or the planer below the adjusting wheel, as high as possible to avoid drilling into the chain that is in the planer base. I installed the sensor portion of the unit by replacing four screws at the left rear column with longer bolts and making brackets from 2" x 1/8" flat steel bar cut to 18" and 2". A long notch was cut in the 18" piece to clear the moving part of the dro sensor while still allowing the bracket to be centered. I thought it was too risky to tap in new holes into the machine in this area which is why I extended the existing bolts that were in the planer. The plate mounts between the head of the new longer machine screws and a new nut. I used washers to align the brackets to receive bracket that comes with the dro. Altogether this took the better part of a day to install including figuring out how to mount it, buy the parts and make and paint the brackets.
It works great to coordinate the wide belt sander with the planer when processing lumber.