Turrets
The very first pass.
Turrets! The first version I quite liked, but we needed to come to a compromise on the pathable space blocking (small turret) vs placement blocking (large platform) to balance how many of these you could spawn / how much space you could block off with them.
In the end the flat legs were walkable so units could run past them, but you couldn't spawn them too close together.
Final models by Chadwick Dusenberry
https://www.artstation.com/artwork/eRlawP