Wall mounted Tetris blocks for display or shelving. Feel free to scale these up! at current scale, they mount with small flat head screws to make the surface flush and slide the blocks in place. For mounting, you can either mount with one bracket for display or two for a shelf.

To line up the holes, place the brackets in position on the blocks. Then place a piece of paper over the model on the backside and poke holes through the screw positions, then line up the paper on the wall to mark the holes.