Our build starts in about 2-weeks. We'll know at that point whether Fresno will connect a flat plate to this option. If they don't, we'll have them install it, run the lines, and we'll connect it ourselves after the fact. I think they should be able to do it, though.
They have some pretty strict rules about what they will and won't do to a Sprinter because they could lose their certification as a MB master upfitter. They'll do almost anything you want them to on a Ford, but MB apparently monitors them like a hawk.
Good Luck! I hope you have more success with them than I've had.