Here is another smart robot that can be used without a perimeter wire. The Lawna is a fully autonomous mower that uses AI vision to map your yard and choose the optimal mowing plan. It also comes with app control and an electronically adjustable deck.
This robotic mower divides your yard into several zones to determine to optimal working schedule. It has various sensors for safe operation around humans. It can climb up slopes up to 30 degrees. This robot has a brushless motor and off-road tires. It also has a triple anti-theft system with real-time GPS positioning. You can find out more here.