You can also treat cover-looking art on the tile as cover. There's plenty of barrels and minecart and such on them.
yea, this is what we are doing.. kind of.
we use corners, edge round and such
But heroes dont cover.. just bandits. at 1st we were doing bandits and heroes, but then the range enemies became quite of nerf down a bit. So we just play the bandits "smart" and they would go for cover when they can.
(we also play them like that on the town, they would not go out of cover unless they HAVE to)