Mark wibbled on Wednesday 11 November 2009 10:32
Just put it up. The correct location will be quickly determined as "the other place, silly!".
Or fix several in every possible location while you have the drill out and simply unscrew the "wrong" ones when she complains.
Akin to buttering the top of a cat before lobbing it out of the window.
[Warning - may cause the Universe to implode]