I see no reason to waste time, money or weight of fans that will produce FAR less than the air you'll be moving through.
You might even want to make scoops on the side (like brake cooling intakes) and have them where they'll direct the air to the ESC and motor.
You might even want to make scoops on the side (like brake cooling intakes) and have them where they'll direct the air to the ESC and motor.