Highly recommend you do this, you will eventually get scratches if you don't. Just get a small amount of 3M paint protection film or similar and cut to size. I did this for multiple cars and I have replaced a few spots due to shifting/wrinkles created from repeated use of racks (took more than a year). You could probably get custom ones... but eventually you'll wish you had some extra later. Just google or look on ebay, you will find stock PPF.