Active job

Attach large mirror to bathroom wall

We have a large Stein mirror from Bunnings 900 x 1200mm to mount in the bathroom. It comes with brackets but it could also be glued on which would be fine. Whilst we could do that, it says that it needs bracing for 3 days whilst it dries - which we don’t know how we’d do! So we decided that it needs someone’s expertise! We also have a small mirrored cabinet to put up in another bathroom. Please advise what it would be likely to cost also