You can arrange all the bits how you want to get the rim central. The main thing is that the anti-rotation washer is nearest to the fork.
It looks like you have flat drop-outs. For dimpled ones you have to make sure that nothing rides up the edge of the dimple, otherwise the front of the drop-out will break off when you tighten the nut.
Don't forget that the motor cable must exit downwards, so the anti-rotation washers must be assembled with the tab facing in the same direction as the slot in the side of the axle where the wire comes out.