In addition to using different fake names (including fake maiden names), you can also use different email addresses and phone numbers. Just keep track of which name/phone/email combo you use for which company you are shopping. This works well with auto dealers and fitness centers.
Some shoppers also give themselves subtle disguises, but they have to be the sort of credible disguises that you can carry off well. Wearing caps or bandanas may work for some; wearing no make-up vs full makeup (complete with lashes and nails) may work for others.
Others just get used to shopping some of the same fast food and fast casual locations over and over, even though the management may know (or at least believe) you are the shopper.
You can gradually expand your geographic range, especially for shop with big bonuses. By expanding the range, it becomes easier to do routes.
If you're in a small town within 1-2 hours drive from a big city, you might be able to work a two-day route driving and shopping on the way to that city, shopping there, and shopping on the way back home--spending the night as part of a hotel shop.
You can take your car (or your friends' cars) in for service at all the car dealers within an hour of where you live. In addition to shop fees, you get reimbursed for regular maintenance that you would otherwise do.
Hope this helps.