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Citi is usually not as picky in Chase in my opinion to short history, but still have some funky rules. As it is a defined APR on a lower-tiered card, it is pretty solid from Citi, but your milage may vary.
I would ask yourself what this card does for you as you already have better cards. If you still have aspirations of Chase cards, it would be in your least interest to get this card. Citi is generally cards you get super early in your build or late IMO.
Why not pay down those balances while you still have 0% APR on the cards you have? If you go for it right now, Citi could give you a limit either very close to the amount of the BT or not enough IMO. If you pay them down over the next 5-6 months while still at APR, you will only help your credit and better chance for a good 0% BT APR card like a Chase Freeedom card that has a life after a BT instead.