AoTW - whatever height you place the TR, it won't affect the fact that the TR thrust is pushing the aircraft right - the roll is only a factor of the MR being tilted left to stop the TR drift. Imagine if the TR was on a very high tail, above the level of the MR - it would still cause TR drift but any resultant couple might reduce (but not negate) the amount of left roll required to compensate for the TR drift.
India Four Two - the aircraft is not fixed to the ground - if it were, say on a spike protruding from the bottom of the fuselage, the TR thrust would only produce a rotation. Since the aircraft is untethered, the pure thrust it generates not only acts about the C of G to counter MR Tq but drifts the whole aircraft to the right as well.