2GIG does not have the UI to offer individual control. That model is not currently officially supported that I know of.
Does it only add to the panel as one device?
It is likely their are technically 5 individual device command classes in that product. 4 independent outlets, and the one “whole strip”.
The additional command class for the 4 individual outlets is likely either not a supported type or the 2GIG does not look to break it into 5 separate devices.
The GC3 has a limited list of officially compatible Z-wave devices at the moment. Compatibility for new devices will likely come out around the same time for both, unless the GC3 has a needed capability that GC2 does not (newer Z-wave version, etc.)