User Manual Nvidia OMEN X by HP 35 Lcd monitor

Yes, this model includes a VESA adapter.

Yes, can be detached. It has a limited amount of adjustment: only tips a bit backward. The height cannot be changed.

The monitor has a base clock if 60hz out of the box, but it can overclock up to 100hz. Advertising it at 100 is slightly misleading because it's not guaranteed, and many panels can get close to 100, but will still be off by a bit when they hit cap.

Yes it is. The other answer you got is completely wrong. The screen has standard vesa mount. It comes with a stand which you can remove, then you can place it on anything vesa.