Kay,
I think that for a guitarist (or many other strings instrument players), it makes sense that what looks like soundholes on the harp (harpists’ string access ports) should face the audience, not the player, as would be the case for the guitar, mandolin, oud, etc.
The other thing I’ve observed, playing both the harmonica and the harp together (I’ve been doing this more the last few days) is that the metal harmonica holder leads you to hold the harp in a somewhat more awkward position-now you’ve got to shift the harp over a little, to a slightly different spot on your shoulder.