I propped up my MFT/3 to match my old table saw height. I glued together blocks of plywood, put some sand paper on one side, then on the other used a Forstner bit (1.5 or maybe more) to cut holes to accomodate the feet of the MFT. Even though I was carful to drill all four at the same depth, a little leveling was required and I did this by throwing in some large washers in the hole of whichever leg needed to be lifted a bit. You can kind of see it in this old pic. Boy, have I bought a lot of tools since then!
P.S. That Rigid was long ago banished to the garage. Only a Festool vac breathes the dust of my Festools now!