Based on these two images it looks like you could mount the H100 in the top inside of the case. The stock fan(s) are on the outside of the case.
If you look at the rad mounting screws in the above photo you'll see in the below photo they are not being used. You could use the outer four fan mount screws on the H100 to mount the rad. You could then just fly with the stock fan from the HAF X or mount additional fans below the H100. Blowing out of case would work best as the airflow is plenty in the X
The H80 most like you could just mount to the back of case. Swap 140mm to 120mm mount rad to it bolt on back as exhaust. Add second 120mm on inside of H80 as exhaust. Push/Pull out the rear of case. Airflow is good so no need to do the suggested intake.