Is this the correct way to vent my roof?
Maybe the links have changed, but if this is the product that you were looking at...



then yes, I have had experience with roof to wall vents... they work; but they are for the tops of roofs, where they meet a wall (like for an addition on the side of a house). So, I don't think it would be useful for your house, if I understand your question correctly. If you installed soffits (or found a way to vent without them), then you may want to use a ridge vent (kind of the same thing), but I don't really understand a way around adding/building an overhang in order to have soffits.

I would like to see a pic of your way/solution around soffits (6" vents installed equidistant from each other).