My dishwasher is mounted under one of those granite countertops. When I open the door and pull out a shelf, the whole unit leans forward towards me. There's a metal tab that's been bent to keep it from moving forward, that parks itself under the lip on the underside of the counter, but it's loose and doesn't have a secure point at all.
How can I keep this from moving? It should be secured somehow, but I don't know how it's usually done.
The solution to your problem is extremely simple. Trust me. :-)
The dishwasher right now is setting wrong.
You need to push the dishwasher inward for a good 3 or more inches. There is plenty room behind the dishwasher.
So push the dishwasher in until you are able to screw that top metal bracket of the dishwasher to the actual wood board that supports the countertop. 3/4" screw is all you need. You can actually see the thick board that supports the heavy countertop. It is clearly double layered for extra support.
(When you close the door to the dishwasher, the door should be even with all the other doors under the countertop.
I hope this helps.
You take care.
Some models have holes along the sides of the door opening so that you can attach the dishwasher to the cabinets on either side rather than to the countertop. I can't really tell if that's the case with yours based on the pictures, but I posted this answer in case it's useful for someone else.
(Side-mount screw hole shown with gray, plastic cover in place.)
Check your instruction/installation manuals. If you don't have the paper copies, you can find them online searching by the model number.
I typically use construction adhesive and glue a strip of plywood to the underside of solid surface counters to provide a mounting point for a small 3/4" #8 wood screw.
I like the expandable poles to help hold the strip in place while the adhesive sets up but you could use bar clamps both likely require you to temporarily remove the dishwasher.
Another option is to put it in place and then use shims between the strip and the dishwasher ensuring the strip is tight to the underside of the countertop.
There is always a 3/4 inch play wood on top of cabinets, onto the granite is mounted.
On your photo I see a metal latch attached to the dishwasher sticking out, made for to be screwed onto plywood.
