Two separate and unique pieces mounted the proper distance apart hold an Asus Nexus 7 Android tablet firmly while still allowing the tablet to slide in and out easily when desired.
I attached mine to the wall with two 3M strips each although more is a good idea. The tablet obscures the removal tabs completely. I recommend placing the strips on the print, putting the tablet into the mount, and pressing the whole assembly gently against the wall. Then pull the tablet out of the mount and firmly press directly on the triangular extensions to secure the 3M strips to the wall.
Monoprice Maker Select V2
I recommend printing at .1mm or finer resolution to maximize the surface area the 3M strips have to stick to. I also find it best to print these with the triangular extensions pointing up in the air and the outside sides of the mounts on the bed. This eliminates the need for supports.
My triangular extensions are cut off due to a power outage while I was printing, but they work just fine regardless. Let the print complete to allow room for more 3M strips if desired or needed.