It seems normal SLI doesn't work right with 0.7 (you'll get artifacts on the screen).
There is Nvidia's VR SLI, but I believe that is more geared toward engine developers. I'm not sure you could add that to Unity (without the source code) though I guess it might be possible with Unreal.
I don't get artifacts with the Oculus world demo (I do though in other demos). Hmm, so we have to wait for the day that Unity/UE4 announce gameworks vr integration?
i7 skylake, EVGA Classified, 2 EVGA 980 sc's, Thermaltake TR2 RX(1000W), 32GB DDR4, Win 10 on an SSD