I have seen most people mount it on the top, or take out the hdd tray and mount it on the front.
Interestingly enough I want to install the same AIO cooler in the same case. I have an hdd so I want to keep the hdd tray. I have seen one video on youtube where they mount it on the front but can still keep the hdd tray. They install the radiator on the front and the fans on the outside of the case, but inside the front fascia cover. I have looked it over myself and I think there is room for the fans in there. They can push over the radiator on the other side. I am interested to see if you get this to work as I want to myself.