As well as breaking AMA rules, this would not be a wise thing to do. Your trainer is designed to be powered by a single propeller engine at the front. Changing this fact will require modification of the airframe to account for the thrust.

Placing these rockets at the wingtip would literally tear the wings off if the plane, which would result in the live rocket engines becoming completely uncontrolled.

Placing them anywhere else will result in a fire hazard, as you airplane is made out of a flammable material.

Now, if you do manage to mount the rockets with sufficient strength to hold them, I'm reasonably sure that you'll find that they will not ingnite at the same time and/or will not have the same amount of power. This will result in a spin that will be very difficult, if not impossible to recover from.