hey guys, i know the thread might be outdated.
But as i recently got the case too myself and i decided to get myself also the h100i platinum rgb AiO to mount it to the top I came up with the same problems.
BUT
it's pretty easy. The case do support 2 AirFans in the top or the Radiator itself without fans!
And that's what corsair promises: 2 Fans up there. Not the combination of radiator and 2 fans like all AiOs normally are.
If you check the product pictures, it definately shows the AiO mounted. But if you check closer, it is not mounted to the top. The AiO Radiator is mounted to 2 of the 3 front fans. You can either change those fans with the from the AiO or just adapt the radiator to those fans and mount the 2 remaining fans to the spot in the top! All fine.