The "mini-magnet-Wall" is exactly the long-sought solution for me:
15 small metal plate, with 15mm almost the size of a 1-cent coin can be placed everywhere by their self-adhesive rear side, where there are smooth surfaces, be it on the mirror, the wardrobe, even on a painted wall. Textured wallpaper and other rough surfaces to be eliminated, however, because there is no full-surface adhesion is possible. The platelets are paper thin, but still stable and kink-resistant, if they have to be possibly removed again. Since then, however, could be a piece of wallpaper or paint stuck, but this appears repairable given the tiny slivers.
The neodymium magnets are incredibly strong, they can loosely hold a few A4 pages. By its elongated roller shape they are easier to grasp than flat slices or cubes. Nevertheless, it is almost impossible, so subtract a magnet with 2 fingers up, but by lateral displacement on the edge of the plate it is then very easy.
These magnetic dwarfs should not be used or placed in close proximity sensitive to interference devices, including mechanical watches, electronic devices such as pacemakers, hearing aids etc. But excessive concern is inappropriate: Starting from 15cm distance, the magnetic field has no effect. A list of warnings is the mission. Overanxious should make perhaps advance to Google under "neodymium magnet" smart ...
As a "Wall" will love these mini plates actually not be called because the wall represents the buyer. But they are a good and almost invisible replacement.