I can not place/host this revit component on a wall or anywhere in the model. How do you insert it?

Thanks for your feedback. This fireplace model can place and align on the wall when you load it into the project. The fireplace model depth is 420mm and it is fix size, so back of the model may look overlap/not align with the wall if the wall thickness is less than 420mm. Hope this could help. Thanks.

This model have two problems:
first: the void box, it's not alligned and constrained to the Wall faces;
Second: the fireplace model should be aligned and constrained to the Wall side place face.
After you correct that, it will work fine.

Sorry this is the fixed size model and the box at the back is the product standard size. You may have to change the wall thickness to hide this box. Repositioning it via the 3D View might be easier for this model, thanks.

I also can not select it once it's placed on a wall to reposition it.

It will not let me change the length, and the box / housing is showing through the drywall.

Hi there, this is the wall-based Revit family and you can attach it on the project wall easily via 3D view by selecting family type from Project browser and drop it on the wall. Let me know if you have further questions. Thanks.