Compose content and include a product within your page or article content section via your Shopify admin where you want it to appear. No need to create a custom landing page OR select a specific template. Just write and include the product z-code where you want the product to show.
Inline products share all the same features as your featured product section with the exception of the product availability. Learn more about featured collections. To change the settings of an Inline product they are located in the Inline products section of your theme settings.