well you can have:
hammer on weight on both sides
hammer on on outer lip only
hammer on on outer lip stick on on inside
stick on on the outside only
stick on on both sides
stick on in the middle of the rim
stick on on the outside and hammer on on the inside
i think theres a few i might have missed but i cant think of them right now...
all of the different positions depend on if the inner/outer lip can fit a hammer on weight, the offset of the rim, the type of rim (sometimes theres specific settings for alloys, etc), the customers preference (if they want to see a weight or not), which is recommended for that style of rim, etc etc