I assumed you were just using the Odams on the tweeter board. If using them on the woofer board, then that cap is most likely in parallel with the woofer driver output leads. This cap position is far less important than a series cap, but still can offer sonic advantages when upgraded. I really don’t think you need to be concerned about direction in this position. Really won’t hear it in my opinion.
Some argue you won’t really hear a sonic difference with series caps (direction) in a crossover. I have not tested both directions while doing an upgrade so I don’t know for sure. I just figure why not install them as the manufacturer states as that is certainly not wrong!