You require proof of cohabitation, so I wouldn't advise going ahead without it.
Thanks @canuck_in_uk, as we discussed earlier in the thread, I do plan to do Outland application since she might have to travel although she will be living with me in Canada. Does applying Outland still need proof cohabitation? Also aside from proof of cohabitation, do they ask for any proof of address in Canada for me or my spouse (since with Airbnb, its quite hard give any proof

Thanks for your time!