That's the problem with tray style perpendicular HDD cages in a standard ATX case. They are really restrictive. That was kind of the initiate for modding my CM690 cages out. I only needed one HDD and the rest was just wasted airflow. Of course, now, my AeroCool Turbine 3k moves 90CFM of air which makes a whistling noise through the modmesh on the front of the case...