Here is the deal spike, once you mount the quiver in the limb bolts you can slide the hood or base off the mount. I never noticed this as long as I've had mine. The thing I really don't like about this set up is you have to slide both pieces off seperately. But I guess you'll have that to deal with with any two point quiver.
I have seen a compound one piece quiver mounted to a curve using the screw on block. If you already have a hole drilled on the riser that might be a option to look into.