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.
"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).