Most garages only have one or two outlets at most. But let’s be serious now. Why would a builder only install one outlet ?. Simple, because he’s only doing what the minimum code requires.
We have a choice here. We could either open the walls up and start running wires and installing boxes. Or we could surface mount outlets with metal boxes and conduits. It’s way easier to surface mount. Hey, let’s face it, it’s a garage right. I don’t think anyone of us would like this inside our house.
Just remember, if the breaker was 15 amp, install 15 amp outlets. If it is a 20 amp breaker, use 20 amp outlets and the correct GFCI outlets.