Question about be quiet! Dark Rock PRO 3

Theoretically it fits:
Max. CPU cooler height: 16.7 cm
CPU cooler height: 16.3cm

But it's getting tight.

For 8 cores?
Is the CPU overclocked or do you plan to overclock it?
If so, I would switch to an AiO/all-in-one water cooling system.
https://www.digitec.ch/de... No more than 240mm!
Air and water both have advantages, but the reason I chose water for mine is also because of radiator height and weight, which pulls on the MB.
But if you want air, you need something strong, so maybe the big brother of the NH-U12S: Noctua NH-D14 (16cm) it is "only" 16cm high, but still has the weight of a baby with 1240g.

It should be enough to install, even if it's close, or would you recommend a different fan?
Processor: I7 6900

for example this one: Noctua NH-U12S (15.80cm)