No direct experience with MP-Rotators on that steep of a hill, but here's my thoughts.
I don't see any reason why the MPRotators can't be installed on a slope. Given that they are desinged to work with water pressures down to 20psi, I wouldn't think being on a slope would effect their rotation greatly. Otherwise, just like with any sprinkler, you'll have to adjust placements to account for the fact that the water will not throw uphill as far as it will down hill. How much? I don't know. But if I were designing the system, I'd rig me up a test stand with a garden hose and just take the sprinkler to the hill side and make a direct measurement.
They are designed to work with 20-50psi of water pressure. I don't realisticly see how being on a slope would affect the rotation
Given that the sprinklers are designed to operate on 30-50 psi of water pressure, I don't think turning them on their sides will