I think it would be too much of a load (amp draw) to run all 3 fans off of just one switch. You may be able to get a switch with a higher amp rating if you check at the hardware stores.
I prefer to use remote controls for all of my fans, then you can just turn on the fans that you need. Of course having separate remotes for all the fans will cost more $$$$$.
Bob in Ocala, Florida, 05' Magnum RT, 76 years young - married 55 years. Superchips tuner & Magnaflow Mufflers. 402 Motoring Version 2 rear spoiler, mud flaps, tinted & painted tail lights. Danko shaker hood, 69' Charger grille, front spoiler, rear diffuser, Installed 9011 & 9012 headlight bulbs, NO-ESP mod, Silver Box, R1 Concepts rotors & Hawk pads.