Today I mounted the brake calipers. They’re the Grove 66-152. The manual says to mount them straight ahead to slightly down. As you can see they’re slightly down. After mounting them I would have preferred them to point a little more forward or even slightly up. I emailed Mark Goldberg to ask his opinion and he said they’re fine where they are.
The mounting plates for the brakes had holes for AN 6 bolts. I would have had clearance issues with them that size so I ended up bushing them down to AN 5.