[seifrob]

My plan is not to drill any holes if possible because the car is two years old. I was thinking about sillicon glue, zip ties and velcro stripes tightened around existing holes and mounting points. The half-skirts prototype is held just by paper tape. I was also considering using small neodymium magnets and "snap on" system (i have found some neodymium magnets for less than a dollar with 5 kg holding strength). Anything must be removable on road without tools, because local police has the power to escort your car to nearest inspection right away if they "have suspicion something might be wrong".