Anything you can do to protect your liner is a good idea. I am not sure if it is called "pop rivet" or "pipe rivet" but we got some of the rubber that is used on floorboards of work trucks (the stuff that protects the carpet from muddy shoes) and riveted it to just the rim of our stpes and to the base of the ladder. No shifting on either. There is what I would call small indentations from our weight using the steps, but that was the only drawback. I have installed a jet under my wedding cake steps to help water flow and keep alge from finding a way to build up underneath them, so I have not yet had to remove them for cleaning. If we do (and eventually we will) get to that point, then we will have a "marker" for placement, but no real damage. It seems that it's just a little post install settling.