I did tried the displayPort hub but it only works on windows, it didn't work for me.
Too bad Zotac mini dp has been discontinued, that will be the best way to go.
I just came across this http://sigmasix-lab.tumblr.com/post/110 ... or-massive , maybe 2 matrox tripleHead2Go will do it.
Here is how the screen are setup in my project https://www.dropbox.com/sh/7e2cwrwkp21a ... MZqta?dl=0