Hands-free male masturbator

I have used many different masturbators with varying experiences, but I have yet to buy one that can be mounted on the wall/has suction. My question/concern is whether the suction is strong enough and if it is truly a hands free experience. Also, are there any that are better suited for the shower. I would love to hear some good and bad experiences to help me make a better choice about the toys I purchase. Thanks

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