That's it, the bumpstops are on the underside of the chassis so you jack the car up, poke them into place (hence 30mm diameter so they sit in there nicely) and drop the jacks so it is sitting on the blocks, read the heights for each corner and write them into the ECU. Then jack it up, pull those blocks out and fit the next size down and do the same. With a jack at both ends it shouldn't take more than about half an hour.