Hi Mate,
with strains you know, I would say absolute no problem... do it. top, fim.. whatever.. But if you don´t know how the strain is reacting to HST it could go either ways. Last run I had a Gorilla Glue FB which I topped on the 4th node, really liked it and turned to a huge bush giving 425g wet Buds, which is great for an auto imho.
If you want to go safe then give them a propper LST.
Good luck and happy trails for the rest of the way..
Servus👋
OimRausch