I think you should ideally have one with foam and one with CO2.
Powder should be avoided, as it will kill electronics.
surreyfire.co.uk
Powder should be avoided, as it will kill electronics.
Types of fire extinguisher guide - Surrey Fire & Safety
All types of fire extinguishers and classes of fire explained in a simple guide. Discover how foam, water, CO2, powder & wet chemical extinguishers work.