The more smoke detectors you have installed in your home, the more your chances increase that you will survive the fire. You must be prepared and have the knowledge to escape safely. Fire is darker, smokier, hotter, and faster than you can imagine. You must know what fire is like in order to escape the danger safely. Fire is dark.
Most people expect fire to be light.
On the contrary, fire is pitch black. Smoke kills not flames. The poisonous gases emitted by a fire actually put people into a deeper sleep and many suffocate without ever waking or even becoming aware of the fire. They die of smoke inhalation because they had no warning. Fire has intense heat.