Underlayment does very little but compromise the locking mechanism of your flooring and cause it to fail. With no warranty from the manufacturer. Sound will pass right through and go around through the electrical outlets, walls, doors, and all other penetrations in the structure.

I'm confused. Are the screws at the edges of the room(s) or at the edges of the rubber rolls? Unless you're impacting at or near the screws I don't think there would be much sound transfer.