Personally, I would never top an auto again, going on past experience.
Lollipopping once flowering is beginning is a great idea though.
Autos with their limited veg time don't need anything that is going to slow them down,,,,,,,,,which is exactly what topping does, it slows them down.
Why not top one and compare it to the un-topped plants and find out for yourself what works or doesn't work for you?