I've been watching through the NHL app with my Rogers NHL Live subscription. It's currently $75 for the whole playoffs. Works great on iPhone and iPad. Once you go 60fps you'll never go back. The only concern is blackouts. Rogers says there are no blackouts for the playoffs.
Another option is through the CBC Sports app.
https://cbchelp.cbc.ca/hc/en-ca/arti...Sports-online-
Hit and miss, if I remember right, it was free last year.