You do ask difficult questions don't ya?
Personally I prefer two mirrows over just the one, balances out the car so much better IMO. However, I (me) would never attempt to drill holes in any panel anywhere on the car, but if you feel comfortable doing that...................or the body shop will cut holes anyplace.
Now, painted or chrome, chrome definately sets off the car better because of the contrast, but with our chally both chrome mirrows were badly pitted, so they were sandblasted and painted body color including the fine blue pearl.
What should you do? Whatever Robert decides to do, either option will be nice.
So I did not vote any option.