I had seen those at one time.
I know with Riley he was all over the place and I was afraid that would
not give him a whole lot of room to play around.... and I was also afraid
he would then be playing and bouncing all around in/on the pee area.
So I bought him an xpen (exercise pen) from
www.Petedge.com
I put his bedding and toys on one side and a peepee pad with holder
on the other that way he would have room to bounce around and play
and then have his potty area.
Worked out great!!