RE: Horizontal stab position
The only thing to really avoid is having the horizontal stab exactly in line with the wing - can cause some really strange handling, when the stab can't decide which side of the wing vortex stream to stick to. Horizontal stab positioned well above the wing, as with a T tail can cause some wild flat spins that may be hard to recover from, since the stab gets well blanked by the wing. Otherwise, I would expect no problem either way.