First, I'm not sure that the consensus is that we'll double team. I think we'll play our usual help defense if he gets near the rim, but otherwise I think we'll defend straight up.
As for fouls... well, there's always the possibility that we could run into foul trouble in the post. But I think you're placing too much concern here on Robinson. He's a very talented player, but he's not some foul-drawing machine. Aside from the Georgetown game, he hasn't attempted more than 3 free throws in any game.
The guy merits some attention for sure. But I don't think we have to design our defense around stopping him.
Miles has certainly struggled with foul trouble throughout his career. Mason did so as well as a freshman and early in his sophomore year. But the second half of last year and for the most part this year (last game of course excluded) he's not had trouble with fouls.
And if one of our bigs does get in foul trouble, remember that we still have Hairston. So it's not like we have to jump down to Gbinije or Murphy or four guards if one (or even two) of our bigs get in foul trouble.