The best option for how Product Ownership might be structured in a company with five products is to have one Product Owner responsible for each product or one Product Owner responsible for all five products. Both of these options are consistent with the Scrum Guide, which states that the Product Owner is accountable for maximizing the value of the product resulting from the work of the Scrum Team 11. The Product Owner may delegate work as needed, but they remain accountable for the value delivered. The Product Owner also provides clarity to the team about the product vision, goal, and backlog 11.

The other options are not advisable for the following reasons:

Assigning as many Product Owners as needed to communicate expectations and requirements to the Scrum Team is not a good idea, as it would create confusion, inconsistency, and conflict among the Product Owners and the Scrum Team. The Scrum Guide states that the Product Owner is one person, not a committee 11. Having multiple Product Owners for one product would compromise the transparency, the alignment, and the decision-making of the Scrum Team.

Having one primary Product Owner and one Product Owner for each product is also not a good idea, as it would create a hierarchy and a dependency among the Product Owners. The primary Product Owner would have too much authority and responsibility, while the Product Owners for each product would have too little. This would undermine the accountability, the collaboration, and the empowerment of the Product Owners and the Scrum Teams.