How to Increase Happiness???

[ShadowDragon8685]

They don't need to offer cover. The wall offers cover. The pots just need to be there to prevent hostiles from pathing through the sandbags and getting into melee.

* amused by the image of raiders being thwarted by a base with humble flowerpots in front of the walls and doors

I already use hydroponics tables as pathing blockers in that manner. Pots would be a lot more convenient, though probably more expensive to block a whole four contiguous tiles.