Not only ask to make your plot is restricted but also be warned that wolves can kill your animals too. I am not sure if they are spawning or are just wild. I found some wolves on my plot killing my animals. I have also seen them killing some of Akita's through the fence and inside ItsKelinu's plot.
Also even though your plot can be restricted, a player can still kill mobs on your plot from a distance so you might want to make it so your animals/villagers are away from the border.
Also even though your plot can be restricted, a player can still kill mobs on your plot from a distance so you might want to make it so your animals/villagers are away from the border.