This brief report presents key findings about the models of infrastructure and types of support that state and local PreK programs use to facilitate successful implementation in FCC settings. Findings are based on data collected through focus groups in February and March 2023 with 15 state and local PreK administrators and directors of intermediary organizations who spoke about the implementation of six state and six city/local PreK systems. These 12 states and localities included some that are implementing PreK in FCC, as well as some that had previously or were currently planning for implementation of FCC in their mixed-delivery PreK systems. This brief also includes additional insights and recommendations from our PreK in FCC Educator Advisors. A key foundation for this series is that state and local PreK administrators recognize the importance and benefit of including FCC in their PreK systems and communities to ensure equitable access, experiences, and outcomes for children and their families. Promising Approaches are highlighted at the end of the brief. (author abstract)