For devices with multiple cables for one phase, what if the loads on the cable are unbalanced?
Best option is to use one large current transformer (CT) to capture all cables with a single sensor. If this is not possible due to installation restrictions, you can install a CT on one of the conductors of the phase and configure a Current Factor for that phase to compensate.
However, this option is under the assumption the loads across these conductors within this phase is balanced. If it isn't (in some rare cases), then install as suggested before as installing all cable inside the same CT will provide the most accurate results.