MFA page customization

We have customised MFA widget for our requirement using auth0-guardian.js. My questions are

  1. Is auth0-guardian.js supported and recommended by Auth0?
  2. What is the recommended way to customise this page like auth0-js, lock, auth0-spa-js or auth0-guardian.js?
  3. Are there any best practices for the customisation of this widget using auth0-guardian.js ?