While not specifically for the Pro, I wrote a bit about this sort of thing at:
and c.f.,
Basically you’ll just want to cut a piece of MDF to the size of your working area and machine holes in it to secure it to the T-track, and then machine holes for the threaded inserts. I’d suggest some additional holes to put a spoil board on top if it, so you have 3 (4 depending on how you’re counting) layers):