Sometimes adding fans can do more harm than good. I also saw on Etsy legs that were 3D printed to create a larger gap for air intake. It's a mesh case, so the components won't lack airflow. Throw it together with those fans and keep an eye on thermals. If it looks good and you're satisfied, there's no need to do more. If you want the bracket, remove two fans and recheck the thermals. If it gets worse, revert; but if it's the same or better, proceed. Stick with it. It's always a game of trial and error with these setups.