I have a few hardware wallets, mainly for testing and to spread the risk by the way. But if you really believe in mathematics, as long as you use it correctly, you only need one wallet. Too many wallets will increase the risk and make seed loss more likely. People's memory is unreliable, and it is easy to forget various passwords and even the location where items are stored. Multiple wallets don't make much sense if they all use the same password and are kept in the same location.