<insert meme of squinting Fry saying "can't tell if trolling" here>

i'd say stay away from mob grinding. Quests are our biggest source of exp
That is objectively and demonstratively false.

Almost all questing while multiboxing is terrible exp/hour. There's few open world places you can combine multiple kill quests at the same time for "good, but not great" exp/hour, but as soon as you take into account the travel time to get to the quest giver, then from the quest give to the objective and then back again you realize you would have been better to just stay in dungeon where you can keep AOE grinding elites without traveling. This is measurable and already proven.

Are you talking about having a lock to summon your party to the quest giver then another lock to every kill objective then back to the quest giver for every quest? That could result in very little recorded /played time, but your time to position multiple locks around every quest hub would result in far greater time & effort for you overall. That also wouldn't be "Boosting" or "Powerleveling" which is this thread's topic.

There's already a great multiboxing leveling guide on this forum. https://www.dual-boxing.com/threads/...leveling-guide! You'll see some dungeon and open world quests listed are worth completing as you're already doing the dungeon run anyway. But mob AOE grinding in dungeons is by far the fastest way to level multiple accounts. I think I posted all my exp/hour rates in the guide. If you find some additional quest hubs that are better, I'd add those to that thread to keep this thread focused on boosting and powerleveling.