Section 12 (Ignition System (Service Information)): Sensor-Knock: Description
WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Two knock sensors are bolted into the cylinder block under the intake manifold 3.7L & 4.7L.
Two knock sensors are also used with the 5.7L . These are bolted into each side of the cylinder block (outside) under the exhaust manifold.