Yes, you can use The Traffic Projection Tool for markets outside of The United States.
When setting up your projection, you can select the “Country Database” you’d like to run your projection in.
For whatever country you target, that’s what SERP database your keyword rankings will come from.
For example, if you select:
- United States → google.com
- Mexico → google.com.mx
- Germany → google.it
Keyword rankings will perform differently based on which SERP database you select due to language, region and other factors.
As a general rule of thumb, you will want to select the Country Database based on where the website is located.