I wouldn't risk it though. I've installed a megaflow 200mm myself in the HAF 912 and the screw holes are very flimsy. Just spend that money on 2 120mm fans and see if you can fit a push pull h100. Try to get slim versions though!
Will a Corsair H100 fit on the top of the HAF 912 with a 200mm fan also up there?
Do you own the HAF912 already?
If not then if i was you i would buy the Corsair 300R which will fit the H100 in the roof, as ive done it.