Its impossible to have more than one more monitor without getting a Thunderbolt 2 dock station. I bought a StarTech Dock Station, TB2DOCK4K2DP, and it works perfectly with my two P2415Q. I have been trying to do a daisy chain with all cables we can imagine, but it does not work without a StarTech Dock Station, TB2DOCK4K2DP. It gets a little bit warm but works perfectly. I hope this will help all of you.