My version of the case is the NR200P, which doesn’t come with the 92mm fan. Mounting a 92mm outside the case is always an option but I guess it will look a bit odd and be slightly more noisy.@bwarr1or
Like @far from home says, you can try with the fan on the outside, but that does mean you'll have an ugly fan outside the case instead of neatly inside. Can you not mount the 92mm fan on the case instead? Or does the CPU get too hot with the 92mm fan instead of a 120mm fan?
An alternative would be using that same 92mm fan on the inside and instead of the 120mm but I guess cooling performance and noise would take a hit.