Items that are placeable such as medium tents, spotlights, generators, hesco boxes, etc. cannot be placed underneath or immediately surrounding watchtowers. This is because the IsBehindObstacle() check in hologram.c does not exclude watchtowers like it does for other objects (such as a car tent).

The following code is currently in place to provide exceptions to collisions within the vision cone.

if ( coneObjects.Count() > 1 && i > 0 )

			{
				if ( object == m_Player )
				{
					//Print( "Mame playera" );
					continue;
				}
				
				if ( object == GetParentEntity() )
				{
					//Print( "Mame GetParentEntity" );
					continue;
				}
				
				if ( object == GetProjectionEntity() )
				{
					//Print( "Mame GetProjectionEntity" );
					continue;
				}
				
				if ( object.IsTree() )
				{
					//Print( "Mame strom" );
					continue;
				}
				
				if ( Class.CastTo( building, object ) )
				{
					//Print( "Mame budovu" );
					continue;
				}
				
				if ( object.IsInherited( CarTent ) )
				{
					//Print( "Mame Cartent" );
					continue;
				}
		
				//Print( "Mame obstacle" );
				return true;
			}

I added the following line in under the car tent check to add watchtowers. This allows placeable objects such as a spotlight to be placed underneath and around the edges of watchtowers. This does not affect collision checks, if you try to place an object on/in a post, it will still not allow it.

if ( object.IsInherited( Watchtower ) )

				{
					//Print( "Mame Watchtower" );
					continue;
				}