The side skirts have ten plastic tree things that clip into the area between the subframe and the door. So you would have to drill 10 holes on each side of the car, and then there are 2 plastic clips underneath as well, not sure how you would mount that. The cost per side skirt is right around $300 each (not sure if they come painted) from the dealership. Then add on color matching and body work to fit your car.
I hit a dog and had to replace a broken side skirt, that's how I know.
