At plugins I 'only' haver RO CSVI Conditional available.
In the documentation I read about Multireplace plugin which I seem to be needing (replacing VM cats for fixed Google Cat for Merchant feed)
Where can I get these extra Rule Plugins?
You can enable other RO CSVI rules from Joomla Extension manager >> Plugins and in Filter set Select Type as csvirules. In the list you can see RO CSVI Multireplace plugin and also other available RO CSVI rule extensions.