Have to agree with DR6K on the reason ground effect is smaller on High Wing Aircraft.
Would disgaree that HighWing has less head room as most Modern High wing Turbo props have the fuselage tube attched to the wing on top with a large bump ie as in C130 or Dash8 and 7 also all the Russian Marks AN24,AN26,AN8 and AN12.
Talking about anhedral all of the above ex Soviets have anhedral tips which must be for extra stability or instability what ever the case.You notice this stuff in the hot sun when you are very tired.
Regarding Props. The more the better for high speed is an advantage, but this same advantage transmits to a considerable yaw change compared to less blades during 1INOP Flight. Hence most of these models have Rudder Boost or Auto Feather No-go options in their POH s and SOPS etc.
I know in a King Air 200 that going from 3 to 4 Blades on some of the newer models means no auto feather no go.
Sheep