Make sure that they are open air or get plenty of breathing.
They emit gas that needs to evaporate not concentrate.
A thing of horror: an UPS rack vs one enterprising mouse.
Only saw the results, and that was in passing.
The rack tech was cussing a blue streak.
Not my first rodeo. As I said, this was engineered years ago, and I'm not about to change that now. I already invested the time in doing all the math.
It is a portable system (like I'm going to move it LOL) and I'm not going to change anything but batteries as they go out.
/johnny