Feng Shui refers to a method of placing (building) things in directions and places to pray for happiness.
Broken mirrors have nothing to do with feng shui.
Also, from a metaphysical point of view, the mirror is an aura, symbolizing the family, and should not be broken at any time. You can think about the consequences of breaking it yourself.
But from the folk point of view, it is good to move things and smash things, because it means "peace through the years".
It's hard. Do you believe in metaphysics or famous swords? This still needs the landlord to choose. I don't believe in metaphysics or folk beliefs. I believe in Buddhism. According to Buddhism, it is our fate to meet this mirror, and I will try my best to take it away.