Only (stage) product recommendations can be found in trigger stages that relate users to a specific action or item (i.e. Cart Abandon, or New Arrivals). This recommendation scheme will show only products that fit the theme for that Cortex stage. This means Cart Abandon will only show items in cart, New Arrivals will only show new items, etc.
Only (stage) is usually the alternative to 1 + Similar Product Recommendations.
Important! Because the number of qualifying items for these stages can be dynamic, use responsive html or ensure that the number of product recommendations matches the number of available products!