Apple TV 4k - Siri international

Physical location is not too important for Siri functionality. Siri works based off of the language set for the Apple TV in settings.

See here under "Apple TV": Change Siri voice or language - Apple Support

Use Siri on your Apple TV - Apple Support

Siri is currently available on Apple TV 4K and Apple TV HD in these

countries, regions, and languages: Australia (English), Brazil

(Portuguese), Canada (English, French), France (French), Germany

(German), Japan (Japanese), Mexico (Spanish), Netherlands

(Dutch), Norway (Norwegian Bokmål), Spain (Spanish), Sweden (Swedish),

UK (English), US (English, Spanish).* 

If you are in a nation that has Siri support, yes.

Below is a link to the current list of countries:

https://www.apple.com/ios/feature-availability/#siri