There is a product out there already like this made from aluminum....I decided to do mine out of PVC......bought the rubber feet from Amazon and CPVC from Lowes.....cut to size, sand the PVC and then paint.....
My cooler lid does not stay open so when it wet will get mildew and nasty inside so this "stick" works just right.
The rubber feet were 7/8 size and 3/4 CPVC.
https://www.amazon.com/dp/B0881NQPVL...roduct_details