I put two screws in the wall and mounted the planter box with picture hanging hooks on the top of the box at each end. It's not that heavy and the hooks take 15kg each so it worked out great.
The lighting is two battery-operated LED spotlights, one on each side of the plants. They are sensor lights and I have them set to come on when we walk past at night. You can also have them on without the sensor feature.
I have rocks covering the lights slightly so you can't see them.
Before and after
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Floating timber features can be a striking feature in any room of your home.