Matomo can be modified to a cookieless tracking. The disadvantage is, that no reports for recurring visitors are possible.
For germany (EU) it is not really clear to use a consent with cookieless tracking, respectivelly wheter this is EU-conform. About that, a explicit visible hint with the info that tracking is in use is required. This can be a pop-up or similar without consent. The current meaning is: Cookieless tracking don’t requires a consent, but a hint.
Just check there is no cookie created. And that if you visit the site twice in a day with the same browser (with a minimum delay of 30 minutes between each visit), you see yourself as returning user in Matomo…
Sorry no… Try to see if EU webistes and/or CNIL website use Matomo?