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I was going to suggest a French cleat, but it doesn't sound like there's any material to screw the cleat into.
I wouldn't do that 3M sticky stuff. I have never had one of those work. Eventually it falls off my wall/door, sometimes with nothing even hung on it. I certainly wouldn't trust a glass item with it.
Maybe a discrete little shelf at the bottom of the mirror to hold it up?
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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