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Go to the master, he will quickly sort it out, it is not clear here.
There are two wires at the door, which are a live wire and a neutral line. There are three at the head of the bed, which means that a ground wire is added, isn't it? Why ground?
If it is a decoration, the wire box is 86 boxes, you can open a little bigger than the box, if it is too small, it is not easy to fix.
There are 3 meters and 4 meters in the convention, and the size can be customized for large quantities.
The neutral wire needs to be connected from the power supply, for example, if there is a neutral wire from a nearby outlet, you can split a wire out.
There are two methods: punching and plugging, self-tapping mechanical fixing method, fixing is reliable, but destroys the tile. With glue bonding method, the construction is simple and does not damage the tiles. You can choose. Good luck!