As for port position, this is almost irrelevant. All you're doing is forming a Helmholtz resonator, and the port orientation isn't important for such a device. So this too becomes a matter of aesthetics, although there are a couple things to consider. One is that you don't want the port blocked, and another is that you don't want midrange energies to setup standing waves inside the port. That's why I like having ports in a position where midrange energy is attenuated by insulation, rather than placing them in line with a reflective panel or opening directly towards the woofer.