By the way, you mileage may vary based on construction etc, but in brick row homes where I rented - I found that roaches from neighbors weren’t an issue. Once eliminated in my unit - I didn’t see them coming back from the neighbors.

Mice however, were much harder to control. I was never able to completely eliminate them. Nearly but never entirely gone - they travel between shared walls. In a single home - I was able to completely eliminate them relatively quickly and easily, but not in a row home.