Well, basically the standard way. Look at the goldrush sky for example.
Also sorry, i did not read. That is a prefab you are using ? Then that prefab probably has been created by someone who knows more, and that someone probably has a more or less good reason to do it like that.
Isn’t there a readme or something, with install instructions.
Basically, what you are doing now is having that skybox inside a box of brushes, and you insert the skybox entity. Then the entity looks at the scene, and renders it to be a sky in game. This technique is especially good when you want to add additional elements, like brushes, which should also be rendered in the skybox.
But all that reading of me on that technique was long ago, so i could be wrong in my remembering.