Mostly it is not reasonable to store barrels in a corner it is much better to put them already on a containment pallet, drum rack or a drum lifter.
Containment Pallets: Items of Drum Handling can be found for stationary or mobile applications. They are used to store drums, for example filled with acid, leached and chemicals conforming to law. This is very important if drums has a raised risk or danger of leakage and in case that hazardous medias could leak-out.
Drum racks: Drum Handling and Carts are especially used to lift horizontally drums and turn them. Drum can be lifted and turned on the rack.
As you can see, Drum Handling should not be loosed out of sight because a drum storage which is conforming to law is frequently needed and used.