Yes, but not as fast as that sharp edge will and actually it would be a flat spot.
If you want to get fancy you line the edge with something like felt to cushion the ball.
Not necessarily better, I've seen balls left in those rings and ball cups overtime develop ring shaped dents also.Better would be a flat "normal" shelf, with a urethane ball ring under each ball.
But it would cost more having to buy the rings.
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