Robot mowers work on most lawns. If it's very bumpy or hilly you just need to go up in price. This summer I visited a farm with a huuuge lawn with trees, hills,

Robot mowers work on most lawns. If it's very bumpy or hilly you just need to go up in price. This summer I visited a farm with a huuuge lawn with trees, hills, rocks and what not. They had two Husquarna 4WD robot mowers and the lawn looked pretty nice.