MacBook pro retina 15" mid 2015 - two monitors 4k@60Hz I'm considering to buy the above mentioned MacBook with the Intel Iris Pro Graphics and without the additional AMD graphic card.

Now my question is whether this configuration supports connecting two external monitors with 4k resolution @60 HZ or not. Moreover SST or MST support will be helpful, too. 
I'm thankful for every source link provided.
From Everymac:


  *This model supports a simultaneous maximum resolution up to 3840x2160 on two external displays via Thunderbolt 2. Alternately, it can
  support a single display up to 3840x2160 via Thunderbolt 2 and a
  single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160
  at 24 Hz via HDMI.