It is mostly race car focussed, my reading of strakes is essentially, it separates the single diffuser into multiple diffusers. If there is a lower point, say a rear differential, you can start the outer diffuser further forward and the one after the differential or exhaust further back. In your insight, and most eco cars, the flow doesn't need to be separated into different channels because the floor is reasonably flat at the back and diffusers are usually much shallower so would not interact with components anyway.
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