Hi, and welcome to the forum!!
I'm not familiar with the Perfect Pool Bottom product, so I don't know how it does with grass and rocks, but I doubt it's going to help with moles. Moles tunnel under the ground, so the damage they're going to do would be collapse of the sand/dirt under the pool when the tunnels cave in. It won't be a problem with liner puntures, but it can be a real problem when trying to keep the pool level.
You can use the google link in my sig to look through the forum for other posts about the product, or about foundations under pools, although you will have to log out to read the results until Ben completes your registration.
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