At this point it becomes trial and error. From your location you could possibly just aim towards the lake (maybe just west of the CN tower) and hit a good combination of US and Canadian channels.
If you have the means, and it is needed, aim the 8 bay towards Buffalo stations and your smaller 4 bay at the tower. Keep them apart, run two pieces of coax the same length into a combiner, then from the combiner into your TV.
You could get ghosting on some local channels, but if done right you shouldn't.

I have an 8 bay aimed towards Buffalo, and I also have an Antennas direct model aimed at Toronto. From Burlington this works well. Still get the occasional drop out from some channels at certain times or because of weather conditions. But the majority come in crystal clear.