In lbrs there is a spot u can park ur toons while u clear the entire instance. Across the second bridge facing towards where the orges are....off to the right there is a ramp that leads down. I park my guys at the top of that ramp

I never do all of UBrs. I leave my guys at the door and clear all the first rooms before the first boss and then I turn around and grab the slaves on my way to the spot mentioned above.