It seems that the designs of the Dell Quick Release System is a bit different; the small metal pieces that protrude from the top of the MDS14A aren't placed right to fit into the back of the SE2218HV. Do these two products use two different versions of the Dell Quick Release System? Is there some kind of a converter piece that I could use to attach two SE2218HV's to a MDS14A?
That is odd. The MDS14A documentation states, "A VESA adapter plate included with the stand also allows it to accommodate any VESA compliant monitor.". And the SE2218HV User's Guide page 8 shows the VESA mount.