When you install your floating floor, do yourself a favor, install it over the foam underlayment. It will add a bit more expense to the floor but it adds a bunch to the package. It cushions, insulates, protects, and extends the life of the floor. I worked in and around Home Depots for almost 15 years and laid many floors in kitchen displays and flooring displays. The Depot has changed many things and one is the knowledge base of it's associates. If they flooring associate didn't recommend the foam underlayment, they should have for all the above reasons. I would also put a barrier of thin vinyl (like a painters drop cloth) between your rubber flooring and the laminate. Just something to stop contact of the neoprene of the top flooring and the laminate, sometimes they get real friendly and can't be separated without leaving little chunks of rubber stuck to the laminate. You can trim it after you put the flooring on it and it won't move but it sure protects your laminate.