Adding Geo-tagging feature like what3words to the check out page

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Hi, currently we use a text box to enter the address data of customers in the check out page. We would like to add a map to the the check out page where customers can search and pin point their accurate address. We would like to use the What3words shopify plugin or google maps plugin (whichever is easy to install!) where the customer will have an option to add his textual address and pinpoint the address. Any help would be highly appreciated.