The easiest solution would be a two employee requirement with a 3rd remote in corporate office. In smaller stores at least one remote. Using a camera for live video that was installed and inspected by corporate.
Yeah but if you're not resorting to just hiring anyone off the street who can talk sales, you get less morons applying in the first place. Less morons, less people who might be willing to treat that "stand in a mall and upsell people" job like they'd do flipping burgers and snotting into the mayonaise, or who need some "side hustle" cash just to make rent.
Pay peanuts and everyone and their dog will apply, pay appropriately and you'll get higher quality applications that you can afford to actually vet.