I have one of these installed in a Corsair 600T. I kept the Antec fan in the position recommended and used the Corsair rear case fan and screwed it onto the back of the radiator with the typical case screws with the hexagonal nut head. But you can't use any too short or they won't reach through. I hooked that second fan up to the case fan header.
Normal spec would see the Antec fan drawing air from the radiator out the back of the case. I've maintained that and put the Corsair case fan behind the radiator pushing air through the radiator and out of the case. I realise it is not connected to the Antec pump header, but it certainly better than nothing.