It isn't mounted so to speak; the case just rests on top of the one below with corresponding holes on each for the pipes to go through.
Here's the setup with the sides on:
I'm getting 29 degrees idle at 12v, 34 full load.
30 degrees idle at 7v, 35 full load.
Rads aren't fully air free yet, neither has the AS5 gone to optimal conductivity. I hope to lose another 2 degrees or so off the load temps.