Here is what I did and it turned out well.
The brown part is a workbench that has a lip on the front of it. Put your ski down and a piece a wood over it. Since I will center mount the skis, I put the dead center of the wood(green) right in the center. Clamp the SHIT out of it. Use 3-4. Next, make 2 wood blocks in wedge shapes(like in the picture), making sure they are the same. Take those and shove them under the ski and be sure it is the same amount on each side. When choosing how far to shove it in and how big of a wedge to make, bear in mind that there will not be that exact amount of rocker in them as the angle of the wedge. Next take a heat gun and put it on the lowest setting and heat where the blue arrows are pointing. But don't be a dumbass and hold it directly on there. Slow, low heat, passing over that area. Heat it 3 times a day for 1 week and repeat the process on the other ski.
Diagram:
PM me if you have questions.