Dreadman

Also not on top off top half slabs, stone or wood.

workaround, place full block, place candle, break block, candle floats, place lightning rod underneath. Placing more candles afterwards is possible.

Also not on walls, not on glass, not on glass pane, not on fence, not on top of chains, not on top of iron bars, not on top off end rods,

not sure if parity, not on grindstone,anvil,flowerpot.