No wall-mounting template. Usually a large mirror, or anything else wall-mounted like shelving and such, come packed with a printed paper template that you can hold up to your wall, level it, and drill perfectly placed holes on the first attempt. Not this mirror for some reason.
So, after a lot of measuring and pencil-marking the wall and adjusting and compensating for this and that and drilling one set of holes that were way off, the mirror was finally mounted to our bathroom wall. And mounted right, nicely centered and all.
Measure TWICE and do your math TWICE before you start drilling.