No point in 144hz for 2x 1080 monitors without a monster gfx setup.
For example...
2x1080 ~= 4.1m pixels
1x1440 ~=3.7m pixels
We can ROUGHLY compare the benchmarks of a 1440 to 2x 1080's with a little adjustment.
In BF4, as an example, 2x 780 Ti's in SLI will average ~91 fps ~ 1440. We can extrapolate this to ~80fps for 2x1080. WELL short of 144hz.
With 2x 780Ti's @ 2x1080 you can expect the following average FPS....
Arma 3: 69
Assassins Creed 4: 53
Grid 2: 129
Metro: 68
Thief: 75
And so on.
Unless you have 2 very good cards and drop the quality, you won't get anywhere near 144hz.