Mains outlet MSO definition

We have a Class 2 device, on which we have a mains outlet. The outlet is intended for use with one specific device (our own class 2 PSU) which in turn is intended for use with one specific hand-held device. The mains outlet would be marked with a reference to the model/part number that can be used with it.

As I understand it, if we pin down the devices that can be used together to a single combination, then they are classified collectively as one item of ME equipment which in turn means the outlet is not an MSO and the equipment cannot form a system.

If the outlet is an MSO, we have to provide a PE connection (which we don't need) and the host device then becomes Class 1.

Is my understanding correct?

Kind Regards