You'll need consent for any data collection not essential to your site's functionality, even if you host stuff yourself.
If all you so is collect how often your pages are being visited then you're not collecting any PII and you don't need a banner, but if you're tracking visitors based on unique identifiers (cookies, IP addresses, etc.) you'll need to get consent first.
Its not only that, its also about the data collected.
Real time data like visitor data and heatmaps aren't allowed, also IP tracking is not allowed too.
Because matomo can be very powerful, more powerful than Ganalytics.
You can let it assign a unique id to every visitor if it visited a subdomain and logged in, so you can now exactly who each visitor is on all of your sites.
