It sounds like you both want the sounds spawned by the scatterer instrument to always spawn near the listener, but for individual spawned sounds to not rotate and move with the listener. If so, there is no way to do this using just one event instance.
Instead, I recommend having your game’s code create new event instances near the listener at random intervals. (You could potentially use a scatterer instrument to randomize the apparent locations of these instances by setting the scatterer instrument’s Spawn Total property to 1.)