Last time I checked Canada had the same similiar photography laws as the US, and that is you can take pictures / photography from a public place of anything you want, and that includes private property, people, oil refineries, military installations, cops, etc. If you are in your yard and take a picture of the neighboors yard it isn't against the law. If you record sound from your yard it isn't against the law. If you record sound of your employees on break talking about the boss there might be a privacy issue.
I don't think there are laws in Canada dictating where you can put cameras on your own darn property. Judging by first amendment audits on youtube Canadian mounties seem poorly educated on this matter and are generating lawsuits.
Montreal does have unique consent laws of taking pictures of of people in public. I seriously doubt it extends to being on your own property and and seeing your neighboors property. If it is...please post the ordinance.
I use Blue Iris on a spare PC, and Nellys Brand IP cams. As many megapixels as you can possible use, and cost $50. Rock solid.
The question is if you want features like zooming, panning, etc.