One mower can maintain front and back lawns only if it can travel between them or you are willing to move it manually. Multi-zone software does not remove the need for a physical route.
The practical answer
The ideal property has a mower-width side passage or gate that can remain available during scheduled operation. The robot can then treat the lawns as separate zones connected by a transit route.
The constraint that matters most
Locked gates, stairs, public sidewalks, and deep gravel can make the two lawns functionally disconnected. Carrying the mower is possible but reduces the value of automation.
How to set the mower up for it
Map the route before choosing the mower, place the dock where both zones are reachable, and favor strong zone-level scheduling if the front and back lawns grow at different rates.
How we research robot mowers
We normalize manufacturer specifications around the buying constraints that actually change the decision: recommended mowing area, navigation architecture, slope capability, cutting-height range, obstacle sensing, charging behavior, multi-zone support, warranty, parts availability, and current pricing. We give more weight to property fit than to feature count.
Prices, specifications, firmware, and configuration-driven features can change. Check the current manufacturer page and local requirements before buying or installing equipment.