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Here are some best practices to avoid importing files that are not located within the root directory:

1. Use absolute paths - Instead of using relative paths, always use absolute paths for importing files. This ensures that the import is always directed to the correct file, regardless of where the importing code is stored.

2. Set up a module search path - Python allows setting a search path for modules, which is a list of directories where Python will look for modules. This ensures that the importing code only searches for modules within the specified directories.

3. Use a virtual environment - A virtual environment ensures that Python packages and modules installed in a specific project are isolated from the global Python installation. This prevents any potential conflicts and ensures that the importing code only looks for modules within the virtual environment.

4. Restrict file access - Restrict file access for the application and only allow access to files stored within the root directory. This can be done by setting up permissions and firewalls to prevent unauthorized access to files outside of the root directory.

5. Use code reviews - Have code reviews in place to catch any potential issues with importing files that are not located within the root directory. This allows for any potential errors to be addressed before it becomes a problem.