I've got a client that offers services to groups of visitors. He's finding a lot of their Yelp reviews are being filtered because (we suspect) they are writing them after returning home so the geolocation of their IP is not near my client's business. We'd like to provide a few of the to a proxy to use to insure they don't get filtered. So what is the best type of proxy? I am guessing a private or semi-private residential IP in the city of the business? I've checked a couple services and ran the IPs through iplocation.net and found that ipinfo.io, ErurekAPI report the correct city but IP2Location and MaxMind report the wrong city. I guess the big question is, which IP geo location service is Yelp using?