Hi Adam
Yes it will work on your 2007 polo because CarPort is specially designed for vehicles of the Volkswagen Group. In my opinion you need a cable which supports connection via K-line and CAN Bus. So you can buy the AGV4000, AutoDIA K509 or K + CAN COMMANDER 1.4. Further you need the combination of licenses for CarPort Basic Modules KKL + CAN and then you should do everything on your car.
Little advice: Currently running the beta test for CarPort 2.0 where it is also possible to test the PRO modules which have that extra functions: adaptation, coding, login, sequential output test, Security Access, Basic Settings. The beta has an expiration date but this will be extended up to the release of CarPort 2.0 again. Hope I could help you a little bit. If you have any questions just let us know
Kind regards Sepp