I first had mine on a glass top. Heated my water up badly. Then I built a canopy that rasied the light about 3-4" off the water. Heat problem solved.
My light sits flush with the top of the light so the switches are exposed. We used 1x6's for the surround and I use 2 1x6's to fill in the gaps on either side of the light.
If it was a bit tall, I could get an 80mm PC
fan in ther no problem. I could get a 60mm but it is not a problem for me. I can smell the fixture when I come into the house so I know it gets warm. I am not sure about that fan but anything would work. I think most people just put an exhaust fan on. I saw one pic recently that had a small desk fan in there ...