My wall faces about 15W and 12" T&K are absolutely fine for a 1.1m dish, so as wod says, size required depends upon the orientation of the house as well as the dish size.
The "stand-off" is, of course, increased by interposing the motor.
BUT: I should think twice about hanging the TD110 in an exposed location on a Moteck Motor. It isn't likely to last very long owing to the significant weight of the motor and the potential wind loading.
Either go for a lighter dish like a Gibertini 1.04m, or make sure the dish is mounted in a sheltered spot.