Can topping be done with an Auto, yes.
Should you? In my opinion, no.
You are at a race against time to grow as much as you can before flowering. Topping it sets you back just to try to even the plants growth but there are better ways to do this like LST. Bend the plant using tie downs.
Topping could make the plant stress too much and force it into an early flower which you do not want.
Hope this helps.