I used this App in America and it was superb. I see that the places you mention in Canada have several gluten free restaurants listed.
You can of course download the App to your tablet or look up the places before you go and print copies of the recommendations.
What I found so brilliant in America, was the fact that I could just use the App wherever we were and a list of restaurants in our vicinity came up. I would then activate the directions which navigated us to our chosen place.