I found that a phone is better for skydemon over a tablet, and having the phone mounted at head height against the left window (in my case, by suction mount). I repurposed an old phone (Motorola Moto G) to be dedicated to skydemon. Never leaves my flight bag.
In this configuration and because of its smaller screen size, I find I spend more time looking out and flying and only need to glance at skydemon to verify that I'm track and to adjust course, or to read time/distance to next waypoint. It's small and not obtrusive.
For airport plates, circuit diagrams, flight plan, etc - I print those out for my kneeboard. I could do it with a tablet, but paper is far easier to access and an insurance against any technical failure.