A Nexus 7 (2012 edition) wall hanger. You slide the tablet through the parts that are attached to your wall. Then you can use the optional wedge to lock it in place.
All of the measurements originates from:
I just used CAD to make a box and then used the nexus model to cut the shape outand made some further tweaks with holes, etc. I scaled it up 5% to leave some space for the nexus to be able to slip in.
Use the wedge to get it to sit there really tight.