To add to that, final PR approval requires the VO to be convinced of the sponsor's intent to reside in Canada immediately after approval. You are required to update CIC with your new address. If they then request proof on intent to return to Canada (and they pretty much always do) and you can't provide any, they will refuse the app.
Also, CBSA can refuse to land a person if they believe the couple does not intend to reside in Canada quite soon.