A single DP1.2 output has 21.6 Gbps of bandwidth.
A screen running at 1920×1080 @ 144Hz even in 8bpp color depth takes 8.96 Gbps.
Connecting 3 screens in that configuration will not fit thru 1 DP1.2 because 3 x 8.96 = 26.88 Gbps. Here’s a link to a BadnWidth calculator: http://www.kramerelectronics.com/support/bwcalculator.asp
There you can see what fits and what not …