Hi,
It looks like south is representative of your health direction as a kua number 4. When you hang activations for your personal energy number in the areas of success, health, growth and relationships, hang them in an area that you do occupy and see. They continue to hold the energy of your intention and serve as a reminder for you and the universe of your goals and outcomes.
If you are working with the level 3 of the course and apply the cures and activations for the time feng shui, place the level of cures and activations that work for you. Many people do just the 20 year cycle stars and yearly stars. The monthly stars move so quickly. I'd take a look at what may be pertinent to what is going on in your life and adjust accordingly.
Over your office door or your front door you want just one hexagram. You are free to use multiple hexagrams on file folders or the such. Marie mentions people using hexagrams on their files in order to infuse their work with good energy.
It's all about your personal experience and where you would like to go with the feng shui.
All the best!
Kat
