Mounts iPad to wall with three screws. Not quickly removable but very secure.
Designed for iPad 2 but should be scalable to fit newer versions. I haven't tried, but here are my best guesses for the scale factors, they should be close at least. Not sure about the button location.
iPad 1 0.528" - scale 153%
iPad 2 0.346" - scale 100%
iPad 3 & 4 0.37" - scale 107%
iPad Air 0.295" - scale 85%
iPad Air 2 0.24" - scale 69%
Print one of each part.
Button will probably need a slight bit of trimming depending on how close the corner brackets are mounted together and printer tolerances.