A general note on thermoelectric coolers, AKA Peltier coolers/devices, are effective when used to PRE-COOL an electric motor...much different than on-board cooling. A lot of racers use both a Peltier for pre-cooling and then a fan (or two or even three) for on-board cooling.
I recommend the Crazy RC model...it features a much thicker copper base and copper clamp (which results in more effective cold transfer) than any other one commercially available.
sl4ppinb4ss3r- I have a fan bracket fabricated on my chassis to allow one fan to draw air into the endbell, and a second fan to draw air away from the endbell. (I personally think it is more effective to draw air AWAY from the endbell....)For a brushless application, it is useful to run cooling fans on the ESC, to prevent any thermal shutdown.