Displates: artistic metal posters that will not destroy your walls
Displate – metal posters | Change your wall, change your world
Displate Magnet Wall Mounting Kit, Including a Magnet, Wipe and Protective leaf
Alternative Displate mounting on the cheap: super glue a "mending plate" on your magnet and hang with a nail. Works great if you have textured walls. : r/Displate