Well i have the rc8 and what have you guys founf to be the place for the esc. I have a rc8 with origanal chassis and 1 with the rcm chassis.

Best place i can find is move the battery box all the way to the front and place it toward the rear wheel all the way in the back.

Let me know if you have any other spots.

Both have the rcm motor mount and reciver servo mount.