It will be 'pulling the rug out from under this disk'. In other words, the propeller will be stripping a significant portion of the 'lift' out from under the two rotors.
Why then does a long-ez or other canard fixed wing work? Or is it because the propeller is aligned with the wing, and therefore strips an equal amount of sink above the wing as the amount of lift it is stripping out below the wing?
As a conventional helicopter moves forward, does the relative wind push the lift out from under the blades?
-- IFMU