Mirror anyone? 61cm x 61cm (Stotfold SG5)

Holes in each corner for mounting screws, which I don't have. The big mirror is reflecting our back door.
Another smaller mirror 31cm x 31cm, for putting in a frame, is leaning against the big mirror. I have not unpacked that.
Not easy to get a photo of a mirror without getting me in it! Lol.
Stotfold.