Are you familiar with shared effects? As the name suggests, a shared effect is an effect that’s shared by multiple different events, and uses the same settings in each of those events.
To create a shared spatializer effect, select “Window > Shared Effects Browser” to open the shared effects browser. Then, right-click i nthe new browser to open the context menu, and select “New Shared Effect > New Effect > FMOD Spatializer.” Give the new shared effect a name you’ll remember, and set its settings appropriately. Then, all you’ll have to do is add the shared effect to your events instead of the non-shared spatializer effect.