How do I get imported items from the library into the right position into my model

Goodmoring everybody,

I just started with sketchup since a few weeks, and i sometimes have problems to get imported products of the extention libery in the right possition on the floor or on a table in to my drawing. I can’t find any tuteral youtube movies where they explain this.
When I use the move tool it looks like the vase is on the shelf, but when I change the image of the drawing by changing the camera, the vase is floating into the air.
Anyone some tips how to get the vase on the shelf ?

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