OP, with exactly 2 cards you'll want to let one report a $0 balance while the other reports a small balance. "Small" simply means anything greater than a few dollars up to 8% or so of your credit limit. With what you have (2 cards) that would yield you the most points.
To the question posed above to ABCD, while I'm sure he'll respond soon enough I'll offer a response as well. While 3 of 15 accounts is still 1/3 the same way 1 of 5 is, there's a chance that there could be a penalty for "number of accounts with balances" since the number of accounts with reported balances is greater by 2. Many times this isn't the case, but some have reported it depending on what else they have going on with their profile. This is the reason why it's always recommended to implement AZEO when maximizing score, because while 3 of 15 may not hurt score more than 1 of 15, nothing will ever be better than 1 of 15. It's probably best for someone to simply do a test on their profile to see what works for them. If you go to 3 and see no scoring penalty, you can comfortably say that 2-3 cards reporting balances is just as good as AZEO on your profile.
