Designing Kitchens and Bathrooms - Install Dishwasher under Silestone Counter

I bought a new dishwasher. The Sears guys installed it but refused to drill into the Silestone counter to sink the screws that lock the dishwasher in place under the counter because they seemed to think they might damage the countertop, and of course the little flanges on top of the dishwasher provided for that purpose are not in the same locations as the flanges on the former dishwasher, so I can't use the holes from the old dishwasher installation. Is it safe for me to use a standard drill bit to drill a pilot hole for the screws? Is is safe for me to drill the screws into the underside of the Silestone counter top? If not, what should I do? I haven't use the dishwasher yet, as I would like to keep it balanced and stable...
Thanks!!
MaxD

Yes, you can drill holes, but you cant use a standard drill bit. You will need to use a masonry bit designed to go into stone or concrete.. I suggest a small bit first, followed by a larger one to open the hole a little at a time..

Be carefull not to go through the top- you won't be happy.

Your silestone should be 1 1/4 thick so you dont have a lot of room for error.

Your screww will need to be real short no more than 3/4" to be safe.

There are no-drill surface fasteners which you epoxy to the underside of any stone or engineered stone countertop. Silestone, or any engineered stone material is very hard, way harder than concrete. I think most granite fabricators would have then available. They are a perforated steel plate about 3/4" X 1 1/2" with a nut brazed on. You use a short machine screw to fasten the dishwasher to the nut. You fasten it to the dishwasher flanges first. then epoxy them to the countertop. Good luck with this.

Thank you both for your suggestions! I will see what I can do about this.