Well...
According to my reseller and tests i made, i choosed NAS-XSR Entreprise edition to have entreprise features, unfortunately, i missed the UPS management point cause i was thinking it is obvious, but i should have seen that network management was not implemented with MGE models, that's clearly my fault.
But, it sounds reasonnable to implement network UPS management in an "enterprise" product cause entreprise usually have several servers and usually protects them with an UPS where slave/master network mode is used.
Also i've bought Entreprise edtion 2 months ago and i can't upgrade to R3 soon.

Finally, if you can implement network MGE management in XSR edition, please do it ! cause the 2 problem i got actually affecting two major features are enough significant :
- Network management of MGE UPS's
- The NAS-XSR entreprise edition secure FTP server is unreachable by firewall protected clients if Open-e server is firewall protected
And i'm afraid that it will cause my projects leaders to tell me to put the Open-e ROM into the trash bin, as we can't have a production server with 8To of data without a working FTP server and not UPS protected.

Thanks for your attention.
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Mathieu