Wilfred, I have a friend at work that flys an RV and uses an iPad. He told me he did something to shade his cockpit. I have not seen it so I don't know if he has some type of visor or tinting. He said it helps but depending on the angle of the sun can still have glare on the screen. If you have a friend that has an iPad, sit in your airplane with it and see what it looks like to you. Be sure to hold it at the angle you would have it mounted. My airplane has a ceiling so mine is shaded pretty well. Here is a picture of what I see.
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