Stainless Undermount

How to Set a stainless steel Undermount Sink When Installing granite countertops again?
We update our kitchen, removing old tiles and counters and replacing the battery. The current model is the reduction of ceramics. We re-install new granite countertops with support a new-fashioned cons below. The recipient of new stainless steel niche. I know that the people of granite can cut the wood and the rest of the flange around the switch circuit, but it means that the granite was not level. The other way is to use some brackets or braces under the sink, how is it done?
They usually Grind t slots under the granite. Then they use T-bolts in the bolt and slide the silicone under the sink. Otherwise, have some new bolts to drill a hole and epoxy, then screw the sink in place after the epoxy dries.