According to e3d docs it needs 4-5 cfm. I dont know that 1 fan will cut it for 2 but i would be willing to give it a shot i also have a second e3d on the way and i have a 2nd fan sitting here as a backup. I would suggest aiming for the shroud to go between the bottom 2 fins. There is much less height between the black and the sink than on the hexagon.

Ill also send you my .ipt originals for it if you want. Solidworks wont import the dimensions extrusions etc but it will at least be workable models.