How to separate on different computer names depending on different locations?

Question

Hi!

We are upgrading our servers, from physical ones to VMWare on one location. Here I want to set up a wds server which installs computers on three different sites.
Our naming policy has different names depending on the locations.
Until now it has been very easy with three different sql tables, one for each location and one wds server for each location.

I still want to use database tables based on service tags and mac addresses, but what is the best way to set it up on one wds server with connection to the sql database?

How do I set it up in the task sequence if I do it there, or in the rules...or in the selection profile? Is it based on the different gateways through the DHCP scope, or what?

Thx :)