You would program it into your shield when you put it up. Like with the mirror shield above, you would visualize that it zaps energetically whatever it reflects.
You can also use physical mirrors as a ward, such as a bagua mirror.
Depending on your living circumstances, energy follows mind, so get in the habit of maintaining your outside space, sweeping, picking up and getting rid of debris, keeping things neat, etc.
This maintains the energy and keeps your imprint upon that space.
I routinely washed the front door of my last place every week or so.
If you use a cleansing wash, even better.
I would then put up inner shields on the other side, and an outer one late at night if nobody was around.
Any spirit you have an ongoing relationship with will work.