single itunes account for iclould "find my iphone"
users can have individual icloud or itunes accounts
the one problem is if you add the company "find my iphone" icloud account first
it becomes the default icloud account in settings, to easy for users to alter
and end up sharing calandars etc accross the whole company
to get around this add the company find my iphone account after user icloud account is setup
and only enable find my iphone on the company iclould account
to add additional icloud accounts go to settings mail contacts calendars
add account , choose icloud
I read something about this restriction.
You call apple sales person to have them up or eliminate the restriction.
Seems there is a limit to enrollment from the same ip address. Could be not a problem in your situation. Could be you use different ip addresses everytime you go to the internet.
It's all a little vage now.