Aloha sheoguj,
It's been busy - sorry for the delay.
You can do the time fengs shui cure/activation in any area of that direction. If the North falls into your bedroom and another room, no need to pack too many things into your bedroom. If the activations/cures work well within your bedroom, you can definatly place them both in their areas.
Although it's best to place it inside the home, you may place it on the outside. Sometimes this works well for windchimes, moving or still water you don't want in the bedroom, etc.
Much Love, Shawn