Product review (2 stars): Was good for a while.
Update:  16 months later, the adhesive failed.  I don't want to do this every year.
Yes, I cleaned the surface before applying the mount.
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So far so good!  The piece of wood that was glued under my granite counter top broke free.  The piece of wood had already broken where the screws were attached in the past, so I thought it was time to find a better solution.

These were easy to install and the dishwasher hasn't budged at all.  It's only been a few days though, but so far so good!