I recently added a second fan using this dual fan mount, but the camera mounting arm that I previously had sat too close to the fans and would bump into it. So, I made a little cutout and extended it a tiny bit.

I printed mine with 40% infill, but you can probably go with less. The heavier it is, the less likely it is to wobble. I can definitely say with 40% infill and a Pi Cam, it's super sturdy.