The brown plug, an 8 mm drill bit should be used. Drill at least 45 mm into the wall.
Good luck with your project!
It's hard to beat a nail into a porcelain plate without breaking it. You should put a piece of masking tape on the porcelain and drill with a special drill designed for tile. You can then insert the nail in the hole.
The tiles can crack if you drill with a concrete drill so you should rather use a tile drill or a glass drill.
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