Sister bought a house a year ago. Best way to keep her safe from ex husband?

My sister has an abusive ex husband that was a high level sex offender, and 8 years later we still believe that he has goons that are trying to look for her. Earlier she was in town (bigish city, 120k) and realized she was being followed by a beater truck that looked one from her ex's family, very similar lookings, dents and all. So she went to the nearest gas station and looped around it a few times for proof …

house privacy safe