I'm sure that as an SEO you've used proxy servers. They are an almost essential tool in understanding local SEO queries as seen from a different location to the one you are physically located in.
Do you know about the different types of proxies and when each may be appropriate for your use?
But are you using them effectively and/or are your proxies leaking information you didn't realise?
https://en.wikipedia.org/wiki/Netstat