That depends on the CSS provider. A special Google opt-in is required so that products outside of Europe can also be advertised with a CSS Merchant Center. Therefore, make sure that you work with a professional CSS provider who has opted in to “Shopping Ads outside of Europe” on Google.
At adstrong, we have all the opt-ins. This means that our CSS and all of our white label CSS are optimally configured – also with regard to shopping ads outside of Europe.