From previous experience multiboxing was/is a grey area for some games since each account (WoW) was a paid subscription, paid for legally or not it is income to the developers. If they found that the CC was stolen or cloned then accounts found to be multi-boxing would be suspended or closed. Since the game is F2P I can see…
They managed something like this for FF14: ARR with the Crystal Tower raid. Three groups of 5 taking on trash together, boss mechanics allowed groups to take on portions of a boss or fill in for another duty. One encounter called for a tank on a Behemoth, another picking up the giant add that would've cleaved the dps/heals…