No, the plastic has a very light adhesive and it sticks quite well to the ruler. You will have to cut it to size but it cuts fine with a regular pair of scissors.
Also, go to the disability aids at Walmart and get the shower handle. It is a large handle with suction cups on both ends. This will help you hold the ruler in place as well.
You can get the handle that is for quilters, but the shower aid works much better and it is much cheaper!