An easy answer to all of this would be to quit knocking on strangers doors to indoctrinate them.
Or, be ready to provide YOUR name and address when knocking on someone's door. If a jw won't even identify themselves as a jw how likely would it be that they will provide the homeowner with their name and address?
Once again you have jw's unwilling to do what they ask of others. They often have the homeowners name, address and even notes about the family! 'husband a Catholic, wife Lutheran, heavy drinker, many kids, etc...etc... weirdos.