If you purchase a Dell 4210 Server Rack, it is designed to have Dell Powerstrips installed. Likewise if you purchase an APC Server Rack it is designed to have APC Powerstrips installed. The APC Powerstrips are designed to install into a keyhole cutout in the back of an APC Server Rack. It is possible however to install an APC Powerstrip into a Dell 4210 Server Rack by utilizing the small set of L Brackets that come with the APC Powerstrip.