The best choice is to do what the pros do.
Hang shelves mirror wall.
Attaching a glass shelf to a mirror is no different.
Hang using picture wire hold the mirror against the wall at the desired position.
Mark the location of the top edge and the center of the frame.
Secure medium weight items such as mirrors artwork and shelves weighing between 20 and 40 pounds with plastic ribbed anchors that spread out behind the wall after inserting the screw.
Hold the mirror against the wall in your desired position and mark the top and bottom corners using a pencil.
Mark where you want the mirror to hang using a pencil.
Set the mirror down.
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If the home improvement project is a complete redesigning of the bathroom and the mirror is not on the wall then that reduces some of the work.
You can buy special plastic anchors for hanging heavy mirrors and pictures but you ll be left with a sizable hole to repair if you decide to relocate the object.
Choose a picture hanger based on the weight of the picture or mirror.