Anti tank obstacle - 28 mm wargaming terrain

Some anti tank obstacles for a 28 mm wargaming layout (1/56 scale). There are two versions, with either three or four obstacles grouped together on a base. The base is 150 mm long and 40 mm wide. From a visual point of view, I prefer the version with four obstacles per base. Also because it is closer to the original design ([link](https://upload.wikimedia.org/wikipedia/commons/6/69/Serine03.JPG)). However, the design with only three obstacles per base allows for a miniature on a 25 mm base to be placed in between obstacles.