ALL props must face the same way. Towards the front of the plane. Irregardless if they are on the rear or front of the plane. A pusher props blades have the opposite angle than a standard ( or tractor ) props blades.

The reason for a pusher props is for when they are used with reverse mounted glow engines that can only run in one direction. For example, a swamp buggy with a rear facing glow engine. For electric planes you do not need a pusher prop because you can mount a standard prop facing forward and reverse the motor if needed.