Google Places uses a browser add-in to add the functionality to SuperOffice. The plug-in is based on Google Chrome, so on any OS capable of using Google Chrome you can use Google Places.
Yes this is possible when you use Google Chrome on the Apple Mac.
To help you find the right company information, Google Places takes automatically the SuperOffice Country name displayed on the company card when you are adding a new company. If you want to search a company in a different country, just select the right country from the country list in SuperOffice.
No, Google Places has only information available on companies.
Yes, Google Places uses the same Google database as Google Maps which is GDPR compliant.