Put Master on top of Companion?

[cescrig]

Mine are stacked.
I have put two small axial fans behind them to blow the warm air out of the sideboard.
Works perfect. No noise. Never more than 40 degrees outside temperature (power supply 48).

I followed Ron's example and installed a low-noise Noctua fan. I've also set it to low speed, and it's inaudible even if you put your ear right up to it.
I separated the Master from the Companion slightly with 35mm rubber plugs resting on a cloth (like the kind used for cleaning glasses), and with the fan running, the temperature is similar to what Ron described.

And it looks fantastic.