I was testing around with the cards a bit. Before joint my wife and I had premium accounts and 4 cards. 2 on each account. As I already said in my earlier post I deactivated one of my cards, because of the 3 card limit. Besides that is no problem for us, it is even less of a problem than i thought, because you can freeze and unfreeze the cards you need within seconds :). So get premium first, order all cards, change to joint and freeze/unfreeze the cards you need