I do not see any benefit to a piece like that!
It does not keep the hot underhood air away from the filter. All it does is make the filter "effectively" pull from a smaller portion as it disrupts airflow over the portion it covers.
Not only that but being metal it absorbs and transfers heat to the air directly next to the filter!
A heat shield should block off the area around the filter from the rest of the underhood air.
Metallic shields such as those are just for looks and actually cause worse performance and more heat soak.
