Yes. Just checked several Enhanced rail builds I have and they are all like that (with the slant).
The Aero Quantum rail (that also fits Aero BAR mount you've got there) is somewhat different. It goes straight up, then rakes back after the 90 flat. I'm still not sure if the anti-rotation tabs would quite clear that upper though. It is hard to tell how much space there is above the CH in that first pic.
The rail seems decent I dont understand the angle it's cut at though. Possibly its so the top rail meshes up with the upper rail better. I think anything flat would work. If you know anyone looking for a 7" I have it listed in the for sale section.