Would it not be possible to get a heavy duty bracket and secure that to the wall with a few screws?
https://www.ukpictureframingsupplies.co.uk/heavy-duty-picture-hanging-32-c.asp
It seems overkill when the mirror's instructions say "hang on a screw" and it's a strong chimney breast.
Is there a slot in the back of the mirror that will retain a screw head?
@hugo7 started
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Would it not be possible to get a heavy duty bracket and secure that to the wall with a few screws?
https://www.ukpictureframingsupplies.co.uk/heavy-duty-picture-hanging-32-c.asp