All fire extinguishers are useless if you can't find them
There are many types of fire extinguishers and you should be able to choose the one that suits your needs. For example, using a 6 kg extinguisher bottle is too demanding for the elderly or child. The fire blanket is effective, but it can't put out fire behind a shelf. A small foam extinguisher is easy to use and not messy, but it must be nearby in the start of the fire. All fire extinguishers are useless if you can't find them.