Why do you worry about unauthorized use of the cards ? Let the issuer worry about it and take care of that if anything happens.

You should always remember: it is not your money that is taken out by fraud, it's the issuer's money, the issuer has to figure out how to recover lost money not you. As a consumer you are 100% protected. So go ahead and carry as many as you want.

There is no risk at all, just rewards.