HoloLens: detect Airtap regardless of Raycast hit

Hi,

I'm a bit stuck on the following, even though I'm sure it can't be too difficult. Currently I use the following code to detect an Airtap and do something:

 public class Example: MonoBehaviour, IInputClickHandler {
 
 public void OnInputClicked(InputClickedEventData eventData)
     {
               DoSomething();
     }
 }
 

However, this requires the script to be attached to a Gameobject, and requires for the Airtap to happen when the user is looking at said Gameobject.

This causes problems when for example wanting to open a menu that is not yet visible, or when placing/dragging an object that ignores raycasts.

How can I detect an Airtap, regardless of where the user is looking?

Thanks