This is the recommended configuration, if possible

The address prompts will be rendered in modal windows on the first step of checkout when the customer clicks on the Continue to shipping method button after inputting the shipping address. It looks like this:

This option has minimal impact on your conversion rate as the average response time is ~0.4 secs and >99% of customers act on the prompts.

The address prompts will appear on the second step of checkout above the Shipping method section. It looks like this:

This option will have no impact on your conversion rate because customers have the option to proceed without acting on the prompts.
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The address prompts are embedded on the first step of checkout above the address form.
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The new Checkout Extensions UI only supports embedded prompts at the moment, it looks like this:
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Address Validator automatically updates the Shopify order when customers make corrections to the shipping address. These are the available options for merchants without Shopify Plus:

This is the default configuration

The address prompts will be rendered in modal windows on the Thank You page post-checkout. It looks like this:

The address prompts will appear on Thank You page post-checkout below the map. It looks like this: