[{aspiring_to_clarity}]

In the US you could get a restraining order which would make it illegal for him to get within a certain distance of you and your family.

Do you have a police report from the incident where he fought you? That might be helpful.

I would get in touch with the authorities and also be aware of your surroundings. The measures you listed may be helpful as well, but I think in a case like this the police would be able to advise and assist you.