i can access the back of the cpu on the mb due to me having the corsair 900d.
I know, but even then sometimes you can't quite have enough room to do the installation from the rear w/o removing the board. You'll have to try and see.
You can also go with a small 120mm AIO like I'm using on my i5-4690K: http://www.newegg.com/Product/Product.aspx?Item=N82E16835181030&cm_re=h60-_-35-181-030-_-Product
It requires very little room behind the board.