Help fo 3 VP config

Hi everybody,

i will work for a show in a theater with 3 VP HD on 3 screens.
Everything will be send by a macbook pro with millumin.
So, i have few questions :
Does my workflow is good ? : millumin + matrox tripplehead + dvi/rjk45 converter + rj45 cable + rj45/dvi converter + VP
in this config, do you have a dvi/rj45 converter to advise me ?

Is it really better to work with Datapath x4 compare to Matrox ?
I think i need to have 4 outputs, 3xVP and 1 preview and i saw it was possible with 2 matrox or 1 datapath ?

thanks by advance