Really I'd top an inch or two from tops of lot and create an even canopy then just flip them 7 to 10 days later, they look sound to top as is, dont worry about this and that typo structure cus the newer shoots will just catch each other up as all hormones in main dominating stem/shoot spread around plant more evenly, kinda happens like that but maybe not as simple as i just put it all. But its how i do most crops, well i first top them really young then multi top the fuckers when they are a fair old size in veg like these and i flip a week or so later, it works a treat on any weed plant, but topping once they not gonna grow wild all over place like if you'd done lots of tops like i do, it will just create a few or more big mofo tops on plant and lots of nice side buds. They will spread more especially those early weeks of bloom.
Just get scissors or finger and thumb nail and whip tops off.
If you decide not too you really need to think about flipping to bloom imo, they are a fair size in that space as is atmo. But i know my preferred option and what I'd do to create a bigger bumper crop.