yes, your case can support mounting either the rad or fans on the top. However, I would not put the rad on top, because they can be easily damaged if something is dropped on them. For fans, you can get grills that will keep the fan safe. http://compare.ebay.ca/like/310563634769?var=lv<yp=AllFixedPriceItemTypes&var=sbar&_lwgsi=y&cbt=y&item_id=310563634769
Also, since the h100i is a self contained unit, you will not have enough piping from the rad to the cpu if you chose to place the rad outside.
edit: no real cooling performance difference if you have the fan and rad on different side of the case