When I was a pioneer, I would just hit a couple doors at a time in places where the manageers/landlords gave us trouble. The driver would just pull up and let one person out to do 2 or 3 doors, then split and come back to some other doors a few days later. In this case I don't think there's a whole lot to do about it, unless your tenants call the police themselves (which I doubt they would do) when you're not around. Plus, the chances they won't even open the door or genuinely not be home are probably good, so the JWs are just wasting their time in the first place.
I understand the way you feel (I think), but I don't see why it's such a big deal they don't knock on doors and talk to people. I manage an apartment complex (I don't own it) myself and I have never made an issue of the mormons or JWs (especially since the JWs would know me anyway) coming around. I don't like to talk to them at my door, but I figure the tenants in my complex can make that decision for themselves.
I guess it goes back to a more fundamental issue: do we, as ex-JWs, view all active JWs as wrong, and inherently mislead and therefore a threat to everyone they try to convert? I don't agree with that assumption. I don't assume that every JW "has it wrong" or is a danger to other people's spirituality. We all need some sort of belief system, and for some people JW-ism works quite well. It's sad, but some people need to be sheep and follow physical leaders and be told what to do. That by no means absolves the leaders of responsibility for their heinous mandates and orders, but what I mean is for some people, being a Jehovah's Witness works quite well. But since we have come out of it and our experiences are negative (inherently so) of course we think they are the devil.