From my experience, the high risk footprints are more prominent during initial GMB setup quality of the Gmail account associated with the GMB and how you access them (IPs,browser,user agent,location, ect).
On the front end side of things, sure G can eventually see a pattern and footprint but you get your boost at the beginning. You will be able to tell if G has caught on to you and your proxies by comparing your GMB analytics/ keyword insights section, URL clicks, ect. If you are still noticing your bot being picked up then you should be fine.