If they all the same you need just distributor, if You need sidewall controller and have for example infinity or other things that have own software, you can setup w/o any hardware setup. Or you can use kramer server, or just buy matrox video card with video out multiplier. Many various variants. If its all independent out: 1 of variants is: mac pro with 6 thunderbolt output, that divide on 3 bus, use miniDP to DVI DL adapter and use device for power over usb for additional voltage, and use 3 datapath x4,or datapath dL8 + x4 etc. There are multiple ways.