I'm a pianist and am planning to use an iPad Pro 9.7 as a digital sheet music reader, so I'm looking for a nice iPad Pro case with the following features, if one exists: 1) Very slim to maintain the iPad profile, but front & back protection. 2) Folds completely back on itself with another magnet to have it lock back and lie completely flat against the piano stand. 3) Has a place to hold the Apple Pencil for easy access. 4) Sleep/wake functionality 5) a variety of viewing angles, including typing angle for Bluetooth keyboard. Am I asking for too much, or does such a case exist? Any recommendations would be appreciated. Thanks!