bro your best bet is using zip ties. there is many different sizes to use, also you can paint them.
hot glue is only good to make a mess. the motor is going to get hot. then the glue will get soft and the motor will unglue. especialy at a show where you would hop it all day. lets just say you burn a motor out at a show. you do need a outlet to heat up the gun to replace the motor.
super glue will leave a build up, the more motors you replace, the more build up you have. and if your tight in space thats not good idea.
i dont make brackets and screw them on, because they take to much room, pluse it weak'ns the frame.