Hi there!

Currently developing a multi region site and have a couple of questions.

I'm going to be using a directory system. Where

'example.com/' - targets en-us users
'example.com/uk/' - targets en-gb users
'example.com/au/' - targets en-au users

1) Am I better putting us behind the example.com ('example.com/us') and then turning 'example.com/' into a region selection page using x-default?

2) If a page adequately covers all three regions. Should I duplicate the content into all three subdirectories and use hreflang or consolidate into one? Will Google see it as duplicate content if the pages are exactly the same?

3) can I target 'example.com' with en-us and just en? so it'd be:
hreflang='en' example.com/
hreflang='en-us' example.com/
hreflang='en-gb' example.com/uk
hreflang='en-au' example.com/au