I put the pumps on a mount (or will very soon) but with only two pumps I just reused a 3.5" aluminum adapter bracket and removed the "wings" for the3.5" device giving me an aluminum shelf to mount pumps on. I mounted these in front of a 120 rad/fan combo that gave me some airflow over the pumps. But we are thinking along the same lines, that the pumps could use some help in getting cool.

I do see a lot of folks using the front 3x bay panels for 120mm air input to the rads. While this has the nice finish matching look on the outside, I tend to mistrust the small hole mesh aluminum as providing good airflow. I have another approach in the works, which I'll have to relate when I've seen if it works (custom cut front panel kind of thing).

Love these builds. They are fantastic.