How to avoid gameobjects collisions while using spine spawnners

[MoonBeam]

Hi I am trying to spawn houses using spline, but my game objects are always colliding. I don't want to increase the flow rate as I want to build these building side by side

 

[Bryan]

Are you using the Collision Extension. 
Make sure that the building are tagged correctly and ingest the information into the Collision. 
In the spawner itself.

[MoonBeam]

For some reason collision check is not working, I have put 'Village' layer to all my houses 

 

my inspector

 

the result

[MoonBeam]

I have reduced the number of instances to be spawned to 1, my results are better but the collision is dependent on  the bound extends, I want the houses to spawn next to each other, unlike in the below image

[Bryan]

Can you please show me your collision extension on the spline?

[MoonBeam]

I don't think I have a collision extension, don't know how to make it. these are my current settings

[Bryan]

The collision extension would be attached to the spline that you are using. 

[MoonBeam]

I only see clear collision extension for the spline. Is there a new collision extension that I need to download ?