However, I am unsure of the safety of random people walking in your store...
It’s the risk you have to bear just like any finance business, since we won't be able to know who's keeping tabs of who. But there should be ways to minimize it e.g. avoid shady neighborhood, control how much your employees know/can do, also secure your home, setup decoy wallets, etc.. Try to look up articles about it online plus you could also observe similar businesses in your area.