Yes. The Perimeter Wire can be laid across a slope that slants less than 10% (4in rise per 3.2ft/10cm rise per 1m). It’s important to note that if the Perimeter Wire is laid across a slope steeper than 10%, the mower will slip and cross outside the wire (especially when the grass is wet).
However, if there is a barrier (e.g. fence or wall) that can protect the mower from slipping off, the Perimeter Wire can be set on that slope.