Q. Why the engine shield cover is not there in the bottom of car for amaze petrol versions. When we open bonnet we can see the ground or road through it and it is not closed in the bottom. Why so?

Most cars don't have a cover at the bottom. The major reason is cost cutting. That said, the critical components of the engine will have a protective casing of sorts (you can check from under the car) in most cars.

Is there a supplier to provide such a shield to prevent rats getting into engine