(x399, AMD 2950x CPU...Thermalright TR4 cooler)

The Asus manual for this motherboard says there are 9 mounting holes.
But the top/middle hole is blocked by the built-in on-board fan shroud, just above the CPU.
The manual makes no mention of this.

Because this is hole is very close to the CPU plus the added weight of an air cooler..... it seems like an important hole for mounting the MB.

I haven't been able to find an explanation.


And while I'm here...
My Fractal Design R6 case includes a powered Fan Port.
But the Asus board also comes with a Fan Port.
Which one to use ?