Many people “grid” their homes with selenite and tourmaline, but I also keep a piece of tourmaline with a selenite wand near the front door of my home. The front door tends to get a lot of visitors and faces some energies that I am not interested in having in my home. (You can read about that here.)
Both black tourmaline and selenite are wonderful crystals for purifying, cleansing and protecting your surroundings. In the case of putting both near your front door, black tourmaline protects and shields negative energies of unwanted people or negative energies entering your home and selenite purifies and cleanses the space around it. Selenite can also bring a sense of peace and tranquilly.
I have mine placed on a table on my porch near my front door. I know for some, this may sound a little too woo–woo, but give it a try and see if your space feels any lighter and different.