Knives or other weapons, if you talk about feng shui, can't be placed in the light. This is because weapons have been murder weapons since ancient times. If you can avoid them, you can avoid them. If you can't avoid them, you can't let their sharp edges leak. If you use their town house, you should also put it in a secluded place to avoid people, so as to play their auspicious role. There are many taboos in the house. Even in the ancient yamen, weapons were not displayed in the main hall, but there was a special White Tiger Hall. That's the reason. If it is purely for decoration, why not change it into something auspicious? If there are children at home, they must not be placed at will, which will hurt the children and easily hinder their growth. That's because children's sense of justice is growing and they are easily hindered by the ferocity of weapons.
That's all. It's up to you.