John Mueller'in bir açıklaması var:
If you can use one of the other means to set geotargeting , you don’t need worry about the server’s location. We do, however, recommend making sure that your website is hosted in a way that will give your users fast access to it.

Meali:
Hızlı olduğu sürece koyver gitsin. Yeter ki webmaster tools'tan siteni hedeflendir.