No, those fans are placed there so that they can cool the HDs and the case at the same time.
I have the same setup in my case and I don't have any problems with cooling.
My dual-PSU PC is so powerfull that the neighbourhood dims when I turn it on 😱
I have this exact case, and it cools better than anything I've ever owned. (It's also a great case, overall.)
I have two hard drives and I intentionally mounted them behind that fan. Cooler hard drives is good. And don't forget, there are four other fans in the case, ensuring good air flow.
Plus! Even if you dont' mount fans in the openings by the hard disks, with a bit of airflow management, you will still get airflow through there, cooling those hard disks.