Im not sure if this questions been answered before, i searched and couldn't find anything. Il put up a pic so you can see what I'm talking about, I have a 27 in iMac 2013, and 2 thunderbolt 27 inch. Im just starting to get frustrated with the height difference and for the life of me can't figure out a way to get them uniformed across the top. Anybody have any solutions? What do the rest of you do?