I need a script developed to efficiently manage a private proxy pool featuring 4 dongles. The primary goal of the proxy pool is to improve connection anonymity. The script should implement time-based rotation for the dongles, allowing them to switch every specified interval (e.g., X minutes) to seamlessly maintain anonymity while in use. Please ensure the solution is robust and easy to manage, with a focus on stability and performance. Deliverables should include a testable script and clear instructions for installation and usage. Let me know if you require any further details or clarifications!