Screen Mapper is an After Effects tool from James Ronan for setting up multi-screen display templates and bento grids. It's built to let you put those layouts together quickly, then animate and export them, all inside your compositions.
The tool covers a wide range of After Effects releases, from CC 2017 up through the 2025 version, with 2018, 2019, 2020, 2021, 2022, 2023, and 2024 in between. That range means it fits into both older installations and current ones without requiring you to change your version of the application.
First released in June 2020, Screen Mapper reached version 1.0.1 in July 2023 with a round of bug fixes addressing comp dimensions, keyboard selection, and extension startup behaviour. A demo video is available if you want a look before adding it to your setup. It's listed as free here.