For Buddhism, any problem comes down to itself rather than the external environment, so Buddhism does not attach importance to housing problems such as Feng Shui.
Your nightmare stems from your inner fear. If you kill a bad person, it is also a violation of your precepts, indicating that your subconscious has not followed the teachings. After having this dream, you don't reflect on yourself, thinking that it is a housing problem, that is, you don't cultivate your heart and don't repent, but seek the law from the outside and find a house. These are not as good as the law.
My humble opinion is for reference only.