How to best address multiple display heads on a multi card system

I'm hoping to put together a system around 4 nvidia K5000 cards which notionally gives me the ability to address 16 heads with different views onto a Unity scene (I have just recently purchased Pro 4.2). I have investigated MiddleVR and getReal3D but I'd like to start from a lower level if possible and create view frustrums direct in Unity which address each separate display. Is this something that's possible under any platform?