Should I add "Noncollidable" objects as Static or Clutter?

[fathairybeast]

I've noticed that, when using NIFSkope, under the Havok Col Filter:

 

1. Clutter items have layers (STATIC, STATIC, CLUTTER)

2. Static items have layers (STATIC, STATIC, STATIC)

 

But what about items that have layers (STATIC, STATIC, NONCOLLIDABLE)? Should I add them as static, clutter, or neither? I don't want to make a mod that CTDs all the time so I'd like to get this right.

[fathairybeast]

In case anyone finds this and needs an answer: I just imported it as a static and it works fine.