Proper number plate 'stickies' are super strong, as long as the surface is fairly flat, with not too much of a curve.
As mentioned, clean the area, (personally, i would never use thinners on a finished paint job, but each to his own...)
My best tip would be, warm up the area, and the stickies, with a hairdryer or hot air gun, this seems to 'activate' the glue for a much better bond.
So good in fact, that it may take the paint off if you need to remove it.....
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