Situation A (image on the left): is suitable for devices which are within 9 lbs (4.08 kg) and 0.5” (13mm) (such as MacBook Air 11 inch), iPad or other tablets.
Preferred angel: 55-75 degree.

Situation B (image on the right): is suitable for laptops that are within 2.5 lbs (1.13kg) and 0.5” (13mm) (such as MacBook Air 13 inch), iPad or other tablets.
Preferred angel: Upper: no more than 70 degrees; Lower: no more than 70 degrees.

Yes, depending on the thickness of your iPad case.
Rmour® Ridge Stand can fit a thickness of 13mm (0.51inches).
The thickness of current iPad models are as follows:
iPad Pro - 0.23 inches / 5.9mm
iPad Air - 0.24 inches / 6.1mm
iPad - 0.29 inches / 7.5mm
iPad with retina display - 0.37 inch (9.4 mm)
iPad Mini - 0.24 inch (6.1 mm)