I’ve not used a tablet with my Air yet but used to have a WiFi only iPad mini with my previous Quad (Phantom 3 Advanced) and either had to cache the maps before I went for a flight or just tethered it to my mobile via hotspot for data.
I fly with the K1 Shield and its good. You need a sun shade for it though.
Undoubtedly. You could use it as a hand mirror turned off almost
Yes you can LOL
I'm using a Walmart special 7" iview SupraPad $39 and is working great with DJI Go 4.