You need 9X of the 6-pin PCI-e connections to make this work with your miner. You need about 1350 watts for this to account for the ±10% requirements for nominal running, perhaps more if you plan to overclock it. They also say not to run it with more than one PSU per board, that may be tricky, because I would have normally said to perhaps get a three CX750s to run or perhaps my juggernaut Evo 1500ewt. If you’re interested I’ve got a couple laying around. Despite that… you would still need another one as my own PSU only has six available 20A connections.
As @murch points out, if you have 1300 watts per device that means you have at least 450 with zero headroom. So if you split it, you need at least 500 watts with the proper headroom without considering overclocking all the way.