We have wedding cake steps in our AGP. No suction cups though, didn't know they make those. Our steps are weighted—see the link in my signature line for photos.

I imagine the suction cups would work if you have a perfectly flat bottom to which they can attach themselves. Keep in mind that steps take a lot of pressure from people getting in and out, kids jumping off them or, in my case, dogs using them as a diving platform. Over the past 5 seasons our steps have worn indentations into the sand under the liner. The bottom is no longer perfectly smooth, not anywhere in the pool. Sand shifts with time.