I put a couple of Noctua NF-14 over the top ventilation holes in my rack, with the silicone mounting thingies and the NA-FC1 PWM controller. They are almost silent in winter. The switch with 10Gb copper is under the fans.
i opened switch and put noctua inside to cool sfp cage that i added heatsink to, in addition to heatsinks on sfp+ module itself. it dropped temperature from 92c to 75c. year later i replaced it with fiber run.