[LongMan]

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I'm not sure i'm able to do and understand all this
I have emby too, but i use the emby for kodi addon for it
Whats the difference then with this way?

From using Emby as a server the experience is basically the same except that Emby for Kodi is design to take over the Kodi library as a single source. You are not expected to add anything to your library from any other source, when using Emby for Kodi. At least that was the original design.
MediaImport is design for imports from multiple sources to coexist. Content aggreagtion is the main goal. So you could have content from your emby server, even multiple emby servers, youtube and  Netflix added to your library.