Despite agreeing on using a plate as the vessel, the group realized that it does not support the candle well, as wind from all directions can still knock the candle over. Worse, the liquefied wax could spill over if the falling candle displaces it from the plate, creating a fire hazard.
The group purchased a ceramic cup that could adequately fit the candle, and tests carried out on it ensured that the candle does not collapse easily. Even if it does, there is a limited radius around the cup where the flame of the candle can reach. Once the candle has been used up to a certain height, assuming that there is no external human disturbances, it would be virtually impossible to knock it over (with the exception of earthquakes).