There are no "power stars" on the front door in period 8 because by definition power stars are good star combinations that are furthest away from the front door. I don't know if there are any in period 7 in Marie's definition either, but I don't have my file with me to check it up.
Anyway, look for a company with a front door in your best or good directions. Off the top of my head, these are the good front doors for period 8 for each direction, assuming always that the front door is in the central front sector (the facing palace).
N: N1
NE: NE1
E: E1
SE: SE2/3 (SE1 is useable)
S: S2/3
SW: SW1
W: W2/3
NW: NW2/3 (NW1 is useable)
All those directions will have a good water star on their entry, which is crucial for business. In fact, for Period 8, I would say those are the best front doors, period. Period 7 houses are weaker in energy although the combinations in some cases will be more attractive. As a further tip, the energies of SE and NW places are the easiest to manage - there are more benevolent energy configurations.
