bro I wouldn't take the risk. My chiller is in hidden in one small corner and I can feel the heat buildup quite abit even though there is sufficient ventilation. You will need some really powerful fans to keep the cabinet cool, not worth the risk.
I'm sure with a bit of creative thinking, you can house the chiller beside the tank w/o it looking out of the way. Maybe create some sort of stool like an inverted U so that you can sit on it while admiring your side view. At the same time when you are mixing water/changing water or doing any other husbandry, you can use the stool as a stand/table.