Consensus is the glass is tempered so I cannot drill holes.
Yes Kirk, I know of the metal under the gasket trick. I am somewhat concerned of the weight of my Colt mirror and the fiberglass extension being a bit too heavy for glue or the metal under the gasket trick.
And again, 2511 is 700 miles away preventing any on the job discoveries or experimentation.
But knowing the drilling holes option is off the table at least narrows the solution selection process.