I would personally have worries with 24S, that‘s over 100V with charged batteries. You could of course run it only at 12s and have all the torque. It just wont reach it‘s max rpm. I, for myself, could not justify having voltages higher than 60V DC in my board. That does not even account for the information in Risk of electric shock. If I research the european extra low voltage or safety extra low voltage directives, I have to conclude that 60V DC is the max in wet areas when protection against touching can not be guaranteed. One could for sure make the system absolutly watertight, but without an isolation supervisor device I would not be trusting it.
Just my opinion on it, from having touched varios voltages before and felt the discomfort of 60V. Feel free to build it your way, I just wanted to leave this here.