Question about setting up a sundial.?

I've been reading online on how to set up a sundial. Although I've learned a lot, one question wasn't addressed. Everyone says that the sundial's gnomon should be pointed north. They also agree that most sundials, since they are mass produced, are designed to work mainly at one line of latitude (basiclly, a generic setting). My question: would positioning the flat, top edge of the gnomon to the north, would it be more accurate to point it directly at Polaris, regardless of the latitude you are at? I am thinking that it would be the "poor-mans" way of doing adjustments to the latitude you are at, without modifying the dial itself. Please correct me if I am wrong.