We've just had a Ram Mount fitted in a Robin DR 400 by our local avionics people (certified aircraft). They fitted it over on the P2 side just in front of the fresh air vent with two USB power sockets.
I used to have my ipad mini in a kneeboard, but on a hot day it did have a disconcerting tendency to shut down when it got too hot.
I've upgraded to the latest mini 4 version which does appear to be more sunlight readable than previous models and the processor does seem to scroll considerably faster as well.