Sorry I’m afraid not. If the hook is turned upside down, the headphone may be unstable because there is no protrusion on the outside of the headphone holder arm for protection after it is turned upside down.
The adjustable thickness range of the desk clamp is 0.20-1.97 inches ( 5-50mm). You can measure your desk to determine whether it is suitable.
Sure, This headphone / headset stand can hold your Apple Airpods Max well.