The most accurate pressure measurements are going to be away from any disturbances in the air stream caused by the aircraft, which begin at the nose and widen out from there. Some of these disturbances change and move about depending on the aircraft's flight path, yaw moment, the wing's AOA, flight control position, and so on.
While it is true that there are other pitot and/or static probes and ports in various places around the aircraft; the engines, yaw damper, and rudder limiter, for example, these positions have different precision requirements than those in the nose, and any local disturbances are accounted for in the signal use and conditioning.