Survey's, like any Moodle activty, can be placed in any Courses - it doesn't matter how you organise these Courses - e.g. in department Categories etc.
But I do not think you are really talking about a Moodle Survey - the Moodle activity.
You should probably consider the Feedback activity.
Also:
"The system level to notify all users in the event we need to bring the system down for maintained and confirm their acknowledgement."
That is a completely different function, and nothing to do with the Moodle Survey activity. You would probably use a main Announcements Forum on the site (as the post will be emailed to everyone), or, as administrator, use a manual Message to all users about a scheduled site downtime.
"Any Idea about new survey type?"
There was a project from the Moodle Parter in Italy to develop SurveyPro - but it appears this is no longer being considered for use in core Moodle, although it may still be available as a plugin (although last report is that it does not work well with the Boost Theme).