Hmm well I think the "problem" is your monitor. The Swift will come with a DP connection so you
will need one GPU per monitor for this setup I think. I say
will because this is not currently possible. At the moment Gsync does not work surround even with TRI SLI connected one DP monitor to each card though Nvidia say they are working on support for this now.
With triple SLI you would have to go for a board that can give you at least a x8 slot for each GPU....Maximus VI Extreme for example does x8x16x8....or RIVE, RIVBE etc do x16x16x8
Of course monitors without Gsync you can set up surround on SLI or tri SLI without worrying about one card connected to one monitor. 3x 1080p monitors on SLI for example...or 3x1440 on triple Tis or Titans...