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Yes you can use a sitemap for each site. All sites uses the same files but not the same database.We 've been testing this and there is no problem with google, the sites are found by google, don't worry.If you can pay someone??, yes,to me jajaja. This solution is under testing so we strongly DON'T recommend to use multix in production. This is an stable version. I'm working to improve some things. I'll let you know about the next version.