We set a cookie upon any view of the invite of an Ethnio screener by domain, so that nobody sees an Ethnio screener twice on the same domain for 30 days. They do not have to click on it to trigger the cookie, only have it appear. This works for both links and intercepts, and you can turn this on or off under screeners >> publish:
Intercepts work by domain
If you have 10 screeners on sample.com, after someone sees one screener, they will not see any other screeners anywhere on sample.com, BUT subdomains are different, so if you have app.sample.com, then your visitors can see another screener on that subdomain.
The main issue with this is that if you are visiting a site to test the screener, you need to clear all ethnio cookies to see the screener. This will not affect new visitors, but as the account owner, just be aware of this when you test out your screener. You'll have three ethnio cookies that normal visitors won't have, just from seeing the screener on different pages or being logged into ethnio.
Pro Tip: Just search for "ethn" in the cookie-clearing part of your browser and delete ethnio_displayed to be ale to see the screener again for testing.