Product review (5 stars): Great Solution
This product works great!  Much better than using side brackets into the cabinets which are very visible.  Used this to secure to underside of new granite counter tops (rough finish on bottom).  Followed directions exactly, lightly clamping for only an hour, and it is holding firm for over a month now so I think its forever.

The final installation does extend down from the bottom of the counter top about 3/16" so you need to have that clearance with your door for these to work.