Holes in booleans

Hi everyone, I am working on this project with a manhole and a plane that will be the asphalt. I made a boolean on the plane with the manhole, but the holes of the manhole aren’t subtracted in the plane and I really don’t know what to do, since it’ll be an animation and the camera will go inside a hole…
Can you guys help me? thanks a lot

Why don’t you use a cube with same measurements as the manhole cover? The z-axis can of course be anything as long as the perimeter is the same.

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