Is the MacBook designed to hang from its display?
I would venture that this is not an endorsed way of mounting a laptop.  Holding an LCD by its housing can cause potential problems with the hinges, as well as pressure marks.  It's also possible to crack the metal as it's really thin around the screen.

Any sort of damage resulting from the use of such a device would most likely be deemed accidental and not covered by your warranty.

You should ask Apple what their official policy is if you're hell-bent on using this.