A mirror this size that leans against a wall needs one thing that nobody thinks about until it matters: it must not be able to slide.
Leaning is how most large mirrors are used now, and it looks effortless. Mechanically it is a tall, heavy object standing on two small points of contact with the floor, resting on two more against the wall. It is stable while nothing disturbs it - and a leaning mirror is exactly the kind of thing children, pets and vacuum cleaners disturb.
So every full length mirror we make is supplied with a wall restraint: a strap fixed to a batten on the back of the frame and anchored into the wall behind. It allows the mirror to sit at its leaning angle exactly as it looks, and it makes sliding at the base impossible.
The back of the frame is built with that in mind - a solid rail across the upper back, positioned to take the anchor, rather than leaving it to be screwed into whatever happens to be there.
The same rail carries the hanging fixings if you would rather put it on the wall instead.