Yes, I addressed them specifically, they are called post-nups. Have you looked at prenups in most Western states? What country are you that generally recognize prenups?
In USA and Canada, family law judges treat them like toilet paper and routinely claim 1 clause in the contract is not equitable or violates case law, so won't count.
Again, post-nups that are not equitable or are not in keeping with case law will be rejected. If you think you are going to be︀ a millionaire, marry a woman, use a pre-nup, and you have $1 million and divorce,︁ and she walks away with $20k, you need to read the case law, very few︂ Western courts will allow this. They will throw it out, and claim not equitable. Unless︃ she has no lawyer or a retarded lawyer, she is going to get an "equitable"︄ share which is typically at least 25%+ and it is usually closer to 50% of︅ net assets.
Post--nups are also problematic, because they often are viewed by the court as︆ violating community property rules. If you think you are going to have a woman you︇ marry sign a post-nup and live in your house in a community property state, and︈ then kick her out with nothing because you have a post-nup, almost no court is︉ going to allow that. Yeah you can find a few exceptions, but family law courts︊ are really just women's courts. The courts use the principle of equity and equitable distributions︋ to override any contract you have with your wife. Maybe you are in some Islamic︌ nation where pre-nups and post-nups are truly honoured, but its not like that in the︍ West.