An improved sensor assembly is provided that allows for close proximity detection of one or more objects by isolating a first sensor from a second sensor within the sensor assembly using isolation boots and a unique mounting structure. Each sensor has at least a portion positioned within an isolation boot, and the isolation boots are supported between a base plate and a support plate by one or more base plate ribs and one or more support plate ribs. The sensor is therefore prevented from otherwise contacting the base plate or the support plate.