The dark pieces seen there are parts of the road. However, they are essentially the same as any other Magna-Tiles pieces, so you can mount them anywhere you want.
![MAGNA-TILES Builder - Black Pieces MAGNA-TILES Builder - Black Pieces](https://buildkitpedia.com/wp-content/uploads/2023/08/builder-3-1024x631.jpg)
The dark pieces seen there are parts of the road. However, they are essentially the same as any other Magna-Tiles pieces, so you can mount them anywhere you want.