How to secure dish washer under granite counter?

Our new home came with a dish washer that is not secured to anything. When you open the door the washer can tip and fall out of its area. You can see the metal mounts on top. The previous owners put some silicone as glue but that didn’t work.

I’ve tried putting shims on top but no luck. Could I drill a small hole, 1/4 inch deep, to get a screw in there?

Open to ideas. Thanks!