In order to prevent your lamp from tumbling or falling, you must place it in a stable position. Maintaining a stable position prevents damage to your lamp. A plate can serve as a stable foundation if you don't know how to set it due to its shape. If you place it on a plate, you can check regularly to see if there is water pooling from moisture.  It's up to you what you do with the salty water. If you do not wish to use it for cooking, you can simply dispose of it. Ultimately, it's up to you.