Howdy.
Long story short, majority of auto growers do not FIM or top and prefer to get their results through pure LST. As there is no control on when an auto decides to flip to flower, topping or FIM'ing at the wrong time can mean no recover time. No recovery and they may get very under-developed mains and bud sights, lower yield etc... If this was the plan all along and you want to experiment with topping autos (growers have been very successful in doing so) then go for it👍. But if this is your first run (I'm not sure if this is your first grow) then playing it safe with LST is the way to go. You can accomplish the same results with LST, thankfully. I even use auto LST techniques on my photo-periods because of how well they work. I have a photo period blue cookies, trained like an auto with zero topping, just pure LST. She is the biggest frigging girl in the tent, and the other's ain't small....! lol.
Anyways, I'll stop there. I wish you luck no matter what way you go with this. No matter what you choose though, couldn't hurt to through a quick bend in there when she's tall enough😉. You won't regret it.👍