Question Case Fan install help

[Mike6942013370451]

I currently have a Fractal Design Define C TG. My question is, how would I go about installing case fans on the upper part of the case? By this I don't mean the two side fans but the ones on the ceiling of the case. I originally planned to put fans up there but couldn't figure out how to mount them.

 

[Lutfij]

The R6 has a rail mount on the top of the case(located under the dust filter(top cover).