Hi,
Do you know how to integrate Google Optimize with Piwik Tag Manager?
Furthermore, any clue what type of consent is requested to be GDPR compliant?
Hi there!
Currently we don’t offer an official integration for Google Optimize, but I encourage you to look into other tools we support in Piwik PRO: Integrations | Piwik PRO help center 
Regarding the consent, I would recommend you to consult a legal/compliance team before deciding how you’ll collect and use visitor data with Piwik PRO.