Call the mall office they all have different rules, they might let u wait outside until the mall opens form the employees once is open they make a line from the door to the store thats what they do here in Broward Mall in Ft Lauderdale
Best bet is to call the individual mall in question and ask their management office. Most enclosed malls won't let campers camp inside the mall after or before the stores open due to security reasons among others. Some may let you form a little line outside the mall, some may not at all. Even in outdoor malls, most won't allow camping.