So as the title asks, can this be done?!

For example our Company has a Website and two more Onlineshops.
All three sites are completly "on their own". With unique Domains, Themes, ...

I found this question: https://www.odoo.com/forum/help-1/question/would-odoo-include-multi-website-by-domain-name-in-next-release-63446 but that didn't help me.

I also played around with "multi company" but I didn't get it.

As I'm able to create multiple "Website Settings" with Google Analytics Key, and so on this must be possible?!
Or for what case are those multiple Website Settings ?!