Welcome to the Q&A Forum

If you use gLTDs as your sub-directories, you can then use WMT to set preferences. See a further discussion here: https://support.google.com/webmasters/answer/182192?hl=en#2 From my understanding (as a hosting provider not a SEO), is that increasingly signals coming from on-page or WMT are far more important that server location, IP or other hosting related information.  This makes sense with more and more CDNs. You may also want to see: http://googlewebmastercentral.blogspot.com/2013/04/x-default-hreflang-for-international-pages.html In terms of what to optimize that is up to you, but the important part is to give Google clues as to what pages you want ranked where/how.