First of all you should see the eyefinity AMD technology.I have 3, 27 inch IPS monitors using this setup with an almost 6000x1080 resolution. (with bezel compensation)
2 monitors are not recommended because everything that pops up from the OS will be in the middle so portion of it will be between the monitor bezel.
For a 2 or more monitor setup i would not recommend a laptop.It will run very hot and when you are in battery mode you would just kill it.Buy a desktop with a r7 or r9 AMD card and if you go to the 3 monitor setup don't forget that you will need an ACTIVE mini display port to hdmi or dvi.if you don't want to go to this trouble then you should buy the Sapphire brand with FLEX technology.
You need to see Contruct 2 working area in an 1.80m long monitor. it rocks!