the pro tapers are pretty high stock but i used to have a set from the sled shed that is in revy they would work i would think, i wouldn't go much bigger than 2" otherwise extentions would be required i think.
i have a 6 inch powermadd on my 08 rmk, and the thats the most the cables will extend with out being tight. and im 6'1" and it could have been a 5 inch even. I think like scuba said and put a powermadd standard 1-2 inch riser.
I see that they beefed the plate up, i made custom 3/16 aluminum plates that go under the stock steel plate on my old edge. I landed bad and bent it so i knew it needed beefing up and i didnt have a welder.