My understanding of Enoch is that it is consistent with the standard near-east flat-earth cosmology. But I'd be interested in hearing your view.
As to whether the earth hangs on nothing, it definately appears to hang on nothing, and to that extent, the description in Job is accurate for the purpose of the statement, and the context thereof.
Something that is hanging is suspended or fixed so that the acceleration of the gravity to which it is subject is arrested. The Earth, however, is neither suspended nor fixed, and the acceleration of the Sun on the Earth is not arrested. The Earth is constantly falling in toward the Sun, although its tangential velocity is sufficient to miss hitting the Sun, and it means that the Earth is constantly falling around the Sun.
I don't see how this can accurately be described as hanging, in any factual sense.
I said 'appears.' Viewed from a distant point, any planet 'appears' to be supported by nothing.