It can be used in a middle of a sentence as well.
'Yeah, so, I was walking down the streent, eh? and I saw this really cool car.'
'are you aware of the fact that it is 9.00 and if you don't leave now you'll be late for the hockey game'
you would say
'it's 9.00, eh?'
If you really agree with someone you would say 'I KNOW! Eh?!' emphasising 'know' and the 'eh' with a slight pause between.
Americans have started their own version of this using 'right': 'I know, right?' Although 'right' has more 'confidence' to it than the more passive 'eh?'; but, that's Canada for you, eh?