A wireless charger facilitates positioning of a device or devices to be charged by the wireless charger in an optimum location relative to the wireless charger. Some embodiments use physical exclusion features to prevent placement of a device at minimum intensity positions in a charging field. Some embodiments use graphical indicia to indicate the relative charging field strength (or field strength indicators such as charge current, wattage etc.) at various positions so that the user can select an appropriate position. Some embodiments facilitate communication between the wireless charger and the device, where the wireless charger maintains a record of the devices being charged and their positions, in order to recommend a charging position.