credit score needed for american express platinum

what credit score you need to be approved for an American Express Platinum card?

will home ownership help to a positive decision?

most of the time (unless you have a really high credit score) they will not approve you automatically for platinum. You need to start with a regular membership and after a while they will offer you to upgrade. Unless you know somebody that is an underwriter for American Express I don’t think anybody can give you the exact criteria.