Tiny holder for small external 7" display

I bought a cheap tiny 7" LCD mini HDMI display (1280x400px), a nice toy for displaying extra status info or a clock independent from your main display. So as not to take up any precious space, I thought of stacking it on top of my secondary display - and designed a very basic holder which should(?) work with at least some monitors and mini displays.

Added v2 for a sturdier hold ;)