Mountable on Wall - Vanilla-Expanded/VanillaExpandedFramework GitHub Wiki
CompProperties_MountableOnWall allows you to make buildings that need to be over a wall, without them needing to be wall attachments like wall lights
It is a comp class, so you just add it in XML in the <comps>
tag. For example here is one of the wall heaters in Vanilla Temperature Expanded:
<comps>
<li Class="VEF.Buildings.CompProperties_MountableOnWall"/>
</comps>
You will also need to add the place worker on the <placeWorkers>
tag of the Building:
<placeWorkers>
<li>VEF.Buildings.PlaceWorker_OnWall</li>
</placeWorkers>