I'm looking to use C+M (in Business) to travel LHR-YQB (Quebec). The best routing seems to be via YUL (Montreal). However, the connection I was looking at taking in YUL is only 60 minutes.

1 - On arrival in Canada, do you go through immigration at the first point of entry (like the US) or at the ultimate destination?

2 - Presumbaly if I missed the connection, they would put me on a later flight? This flight seems to be only 30 minutes later so the connection is 1 hour 30 minutes.

Any thoughts about whether I should even be thinking about either of these options?