A extremely loud panic siren, and a personal panic alarm that you carry with you, arlo cameras inside and outside, arlo also has a alarm. People like that hate loud noise. cheap door notification boundary alarm before your door. often thats enough. chain on door so it only opens so far , then use a small fire extinguisher on them through the small gap. I dont know if that any help. a water sprinkler spray system at you door, soak them, without opening the door. maybe silly ideas but something to consider.