I did my M&S using just low pro ramps raising the rear. Used self taping screws / 3m vhb.
Predrilled the holes on the skirts. Wiped car underside and splitters with isopropyl alcohol. Applied tape to splitter. Lined up on car (with one side lifted close to the car’s skirts using paint cans/boxes. Pulled vhb tape cover. Started at the rear. Keeping it aligned how I wanted as I married the skirts to the car. Then used short hand screwdriver to screw in self taping screws.