Product review (1 stars): Followed both sets of instructions that were included in the ...
Followed both sets of instructions that were included in the package, cleaned the underside of the granite thoroughly with isopropyl alcohol, positioned the brackets, peeled off the red tape and attached to the granite, clamping them for 5 minutes.  Didn't so much as open the dishwasher door for 24 hours.  One of the Grabbers simply FELL OFF the granite
They're supposed to withstand lots of vibration, but they can't even withstand gravity.