Just so people know: I've got MSI GTX 1080 Ti, and it's only got two displayports. So, I managed to get three 1080p monitors working at 5760x1080 @ 144Hz, all three are. Using this:
https://www.amazon.com/gp/product/B075754ZYC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1This DisplayPort hub is passive, but will most definitely get three 1080p's on nVidia Surround if you lack at least ONE displayport. Not sure about other resolutions and refresh rates, as your experience may vary, but it will support my setup beautifully.