Do I Need a Fan for Hard Drive Cooling in an Open-Air Case?

I've recently switched to an open-air case (xtia xproto-atx) for my PC. I have two HDDs that I use for storing video files and caching. In my previous regular case, I didn't realize how warm these drives could get—especially when I'm editing videos. I can't check the exact temperatures, but they definitely feel quite toasty while in use.

Now that I'm in an open-air setup, I'm curious if I should get a fan to help cool down the HDDs. My case doesn't offer a way to mount a fan directly for that purpose, so right now, the HDDs are receiving no active cooling. They're just sitting in stagnant air. I was considering using an HDD cage and attaching a fan to it as a cooling solution, even though it may not look great. What do you all think? Given that it's an open-air setup, is it okay for my HDDs to run without any cooling, or should I find a way to actively cool them?