There is growing interest in multiple, widely separated, radar systems that employ mobile stations such as ground surveillance radars (GSRs). These are usually portable light-weight systems that may be carried by one person or mounted on a vehicle and may be employed in large numbers. In a resource-aware operation, only a subset of the existing transmit and receive antennas may be used to accomplish a given target localization accuracy. Commonly, multiple target localization is performed by scanning a given area cell-by-cell. In this paper, clustering of the multiple radar system is proposed, such that each cluster/subset covers a different search cell with the same accuracy threshold. For a specified number of search cells and accuracy threshold, the overall number of active radars is minimized. Fast approximation algorithms are proposed and evaluated.