The most expensive robots should. For the mid-high range (such as my robots, Worx Landroid L 2000), you typically get to only define a starting point, and the rest is up to the form of your lawn. You might, for example, have multiple sectors or parts of your lawn connected by a "corridor" - a narrow strip of lawn, where the boundary wire doesn't quite connect but rather lets the robot through. That way you might want to define the first part of your lawn as Zone 1, and after your robot has followed the boundary wire to the second part, you could define that as Zone 2. Unfortunately, most mid-high-range robots also come with some smart algorithms for traversing corridors. My Landroid is exceptionally good at escaping one sector of my lawn since I have a corridor that's about 50 cm wide (that's about 1/9 of the height of a double-decker bus for you imperialists out there!) - and it's easily able to slip through.