Rack/component fans?

Think cabinet, not rack. Best that you isolate the components from the acoustic energy in the room, racks do not do that. I've tried racks, many different kinds but found the cabinet works best, and yes, proper ventilation is a must. The latter is not hard given the low cost of laptop coolers on the market.

Cooling fans for laptops can be run from usb power strips that get there power from an AC wall wart. Meritline sells one for $8 that can handle seven usb plugs and it includes the AC power adapter. The also have one $25 but the $8 one will do the trick. I've seen laptop coolers for less the $15, that are also most silent. So, trying one can put you in business for less then $25. Enjoy the music.