Dear V. H.
I used a clear silicone adhesive to basically glue the sink in place. I rotated the sink prior to installing the P-trap to make sure it was in the right location. The silicone will hold the sink in place and seal around the opening so water does not leak in under the rim of the sink and countertop. I've never had a problem with it coming unglued or leaking.
Craig Lang
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