How to configure two main parallel processes that calls 4 parallel tests

[Skoda3]

I have work order with 20 UUTs to be tested.

UUTs (PCBs) are mounted on a plate. Each plate has 4 UUTs.

The process is configured in the way that two plates can be inserted at the same time (8 PCBs). This two plates should be totally independent (parallel). Each plate, each 4 UUTs should also be tested in parallel since they have their own hardware and  instruments.

So lets visualize the process by picture.

My Questions are:

1. What model should I choose for implementing tests (with the less effort possible)?

2. Can I choose parallel model example and moderate it so that UUTs on the plate are tested in parallel?

[TBasel]

Since you mentioned clearly you need plates to be tested independently in parallel, then you have no choice other than Parallel Model.

Anytime you have asynchronization (independency) with multiple threads, then Parallel is the best choice.

Consider the image attached. 

Regards.