Prerequisites
You have enabled the Preorder option in the Parameters of the module.
Product Configuration
You will simply indicate a date of availability in the Quantities tab of the module:
Important Note: Because of a PrestaShop limit, this feature is only possible for products without combinations.
In the Amazon Seller Central back-office
The Restock Date field will be automatically filled by the module:
On the Amazon front-office
It will be visible and clear to the consumer that the product is only available for preorder: