title: Use both anonymize_ip and optimize_id on Gtag.js
body: <p>I have set up the anonimize_ip parameter because of GDPR compliance etc...
  My question is:how can I also use the optimize_id parameter?</p>
  
  <p>1) In the same config line:</p>
  
  <pre><code>gtag('config', 'UA-123456789-1', { 'optimize_id': 'GTM-1234567'}, { 'anonymize_ip': true });
  </code></pre>
  
  <p>2) In two different lines for the same config:</p>
  
  <pre><code>gtag('config', 'UA-123456789-1', { 'anonymize_ip': true });
  gtag('config', 'UA-123456789-1', { 'optimize_id': 'GTM-1234567'});
  </code></pre>
  
  <p>Thank you very much!</p>