The Modulex Planning System 125cm by 50cm board has brackets on the back to hang it on a wall, however mine was missing the mounting cleats when I got it and only had the board-side brackets.  This is a small section of cleat that can be stuck to a wall or other vertical surface with 3M Command Strips (large size).

I printed this rotated, sitting on its back (the wall side) so that I would have a nice flat surface for the 3M Command Strips to stick to.  This meant that I needed a material with good inter-layer adhesion, so I used 3D-Fuel's Tough Pro PCTG.  Used 5 perimeters, an 0.6mm nozzle, and 20% honeycomb infill, and that worked great.  Just make sure when you stick them to a surface that you have each side perfectly level with each other so the board hangs correctly and distributes the weight properly.