You need 2 pieces of evidence from every transactionYou need 2 pieces of evidence that agree from every transaction, which is a significantly harder standard to meet.
For now, IP address is being accepted as one of them. However, most estimates seem to put geolocation as accurate only for about 90% of checks, and even if it's accurate, the information you'll get back typically won't be enough to determine which rules to apply in member states that have regional variations in their VAT rules.
It's basically impossible to comply properly with the current rules using a fully automated system, and therefore basically everyone trading on-line is risking compliance issues because you can't avoid them. The whole thing is kind of a joke, except for the not-so-funny part where your number comes up and you get business-destroying levels of overhead dealing with the audit.