Which is the best option to take as I am trying to expand our US store to new markets (UK and AU)

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Good day everyone!

Need your expert opinion on the most efficient way on how to expand to UK and AU, primarily with the ff goal  in mind:
- same domain
- show local currency when a UK or AU customer lands on the site

I been reading from previous thread like use the default shopify geolocation but is on the fence after seeing the mix reviews the app have.

Thanks in advance!