Hi,
I think that a hexagram above the door does not change the location of North, South, East, West at all. So, if you place a hexagram above the door you change the frequency of what you carry into the world and bring back to your home! This can be life-changing!
If you place a hexagram above your bedroom door it does not affect the direction your bed faces, it only affects the frequency of what you carry out from your bedroom and bring back into it. Consequently, for choosing the hexagram above your bed just measure the direction and simply choose the hexagram with the best outcome for you.
All the best to you,
Astrid
