Might be difficult to find an electrical outlet in a mall. Can’t run an orange extension cord, but some malls have outlets recessed into the floors with a brass cover for just such contingencies. You may get lucky. I checked into a nearby mall previously and the rent was horrific. I can’t recall what they wanted, but it made me gasp. The merchants in the food courts pay big bucks to be there, so most malls don’t give their space away too cheaply.