This is a cradle to prevent the Cinelock quick release (from 16x9) from twisting when mounted to a SmallHD DP7 monitor. Please note the USB plug becomes obstructed, although the HDMI in port should still clear depending on the size of your HDMI plug's cable.
In case you're wondering, I have no idea if this works with the AC7. The distance between the two ears is 27mm.