Replace "Your graphics driver" with your actual graphics driver (e.g., "intel" for Intel graphics).
Instead of installing high-risk third-party applications, you can use more secure methods:
Already, platforms like and Adobe Express offer 16-grid video templates, and services like TiledMedia or Userful provide enterprise-grade video wall software. For home users, an iPad running OBS Studio connected to 16 browser windows on a large 8K TV can achieve a similar effect for under $2,000.