Yes, but...
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How The New Ferrari FXX-K Evo Can Make Over 1,800 Pounds Of ...
https://jalopnik.com/how-ferraris-ne...800-1819951838
How The New Ferrari FXX-K Evo Can Make Over 1,800 Pounds Of Downforce. ... Ferrari added vortex generators on the belly pan, which "capitalised on the accelerations created by the rear system ...
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Devon GTX. Supercar made in USA - Autoblog.gr
https://www.autoblog.gr/2009/08/19/d...r-made-in-usa/
The team's efforts led to the incorporation of a three-piece belly pan constructed of carbon fiber. In addition to providing enhanced under-car surface appeal and aerodynamics, the belly pan carries revolutionary "vortex generators" for improved downforce - a key enabler to the vehicle's exceptional agility and balance.
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I can't find the picture[s] I've seen of the underside of a modern race car, but vortex generators generally are used to add energy to the flow to encourage reattachment to the body. The race cars (I saw) use them behind the front wheels at the beginning of underfloor tunnels. On a diffuser they'd be at the front of it, but given the nature of the airflow in the plenum between the underbody and the ground, fences are what are used, to segregate and straighten the flow.