I checked out the Diablo web site.... Very nice set up... Nothing even closely resembling that in the Montreal area. In all honesty Western Canada is more user friendly for guns and shooting. If you decision is based solely on shooting Rimfire Competition Western Canada has Quebec beat by far. If your decision includes being closer to the family here is a little more information for you.
Quebec Shooting Federation. Find a club:
https://www.fqtir.qc.ca/en/find-a-club/Fish and Game Club 40 minutes south of Montreal. 6-7 Good solid benches.
https://www.facebook.com/Lassociation-sportive-chasse-et-p%C3%AAche-Ste-Clotilde-2643535625673127/Club de Tir Saint Jacques le Mineur. 30 minutes south of Montreal. Has potential with 20 benches but not Benchrest quality.
http://acpl.ca/index.php?pages_id=14&t=CarabineSorel Shooting Club. I have never been there but looks impressive.
https://www.youtube.com/watch?v=klxkVW2jFUk&feature=youtu.beOr there is something I would be looking at, 2 hours south of Plattsburgh NY.
http://dunhamsbay.net/benchrest/Good Luck in your decision making!
Ken