Page Code/Setup:

<script src="https://fast.wistia.com/player.js" async></script>
<script src="https://fast.wistia.com/embed/mw3obnexwb.js" async type="module"></script>
<style>wistia-player[media-id='mw3obnexwb']:not(:defined) { background: center / contain no-repeat url('https://fast.wistia.com/embed/medias/mw3obnexwb/swatch'); display: block; filter: blur(5px); padding-top:56.25%; }</style> 
<wistia-player media-id="mw3obnexwb" aspect="1.7777777777777777"></wistia-player>

The above is pasted directly into a Webflow "Code Embed" element.

This has slightly different scripts/syntax, which I pulled from an embed Philippa provided in Slack.