Polk v60 in-ceiling speaker orientation?

[deadchip12]

I just purchased 4 of this polk v60 as my dolby atmos in-ceiling speakers. As you can see in the picture, it has aimable tweet mounted on some kind of fixed bridge. My question is at which o'clock direction should that bridge point towards when the speaker is installed into the ceiling? The tweeter and woofer don't seem to be at the dead center of the speaker's dome so I figure if each of these four speakers are installed in different orientation, the distance of each's tweeter & woofer to the main listener will vary and that's a big no no, correct? Such a weird design.