I’d like to know if it’s authorized to collect custom dimensions on ppms hits if the user doesn’t consent to data cookies. It only concerns non-PII data, such as page type or event data for a button click.
In terms of functionality - it is possible to collect all this without the user consent.
Unfortunately, I’m not able to give you any legal advice regarding this matter, but I recommend consulting a legal/compliance team before deciding how you’ll collect and use visitor data with Piwik PRO.