This is what everybody typically comes to recommend.
However, we found that the MiniDP adapter on this ring is actually fatter than the distance from the bottom of the port to the bottom of our laptops (Dell E series), so it was bending the adapters and the ports. We switched over to manually tethering these with coated fishing line.
With USB C getting more popular, we've been debating what to do - it's pretty unwieldy to have two 6" adapters tethered to one hdmi cable, and the ring option sucks, and the cable we actually want (CAB-HDMI-MUL4K-9M=) is $600.