A:AnswerYes. I have mounted this television on drywall in two different homes. You just have to make sure you find and screw it into the studs in the wall
A:AnswerYes, there are two tension screws on both upper arms of the mount. You have to use the included Allen wrench to tighten the screws so that the TV stays flat and doesn't tilt.
A:AnswerThis mount does not support 90 Degree Tilts. The packaging only mentions that it can swivel left or right up to 45 Degrees and it can Tilt up or down from a rang of -8 Degrees to +12 Degrees.