Track form submissions without emails?

Hi there!

We are planning on doing a Net Promotor Score survey on our website. Our clients would be emailed a link to our webpage which has the traditional “rate us from 1-10 and give us feedback.”

Without asking for an email address (as these normally don’t) I would like to be able to track who submitted the form.

I was thinking of generating a different link per email we sent or using Google Tag Manager, but I’m not quite sure how to put all the pieces together. Are there are any creative suggestions?

Your help is greatly appreciated; thank you!

My website link: https://nexient.webflow.io