I think that the best organizational structure would be a mix between functional organization and matrix. There aren’t silos and information is given to everyone in the department depending on the project. Even though you are reporting to more than one person, this means everything will stay in check and on track. You have to make sure there are no collisions between schedules when doing this. No one is doing all the work all at once. There are multiple people working together to achieve one goal and report to someone with their results. I also believe this is the most effective because all the information is in the open for people to work together. There is knowledge transferred from project to project within the departments and no project or department silos.