kind of a punt tbh, AT is just not going to be good a lot, you are not being given the right price to draw at your flush, and your two pair outs are questionable. CO range is quite strong, as flop is dry, and he shouldn't really have a 3-bet range on such a dry board, so he still has all stronger Ax combos + sets / 2pr in range. He also has position.
turn is a clear check / fold for me, given the action
also, check raising flop, we lose all of his pure bluffs and weaker showdown hands, and isolate his stronger combos. This board is going to get barreled a lot even 3 ways with position, if we check / call flop, we might be able to check / call turn (like this one specifically), or check raise on a ten.