PlacementGroupType

Enums
PLACEMENT_PACKAGE A simple group of site-placements (tags). Basically acts as a single pricing point for a group of tags.
PLACEMENT_ROADBLOCK A group of site-placements (tags) that not only acts as a single pricing point but also assumes that all the tags in it will be served at the same time. This kind of group requires one of its assigned site-placements to be marked as primary for reporting purposes.