Really good question. While New Zealand is supported by Shopify Payments, the POS hardware isn't available for there currently. Hopefully it will be soon. I'll make sure to add this as a feature request for you!
In the meantime, the Shopify help guide here has a list of Shopify supported third party hardware for POS here.
Nick | Community Moderator @ Shopify (OOO until June 14th) - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog