Device carrier for the 4D E skirting board duct, for the installation of two compact M45 built-in devices in the format 45x45 mm (e.g. socket, data socket, antenna socket, USB charging socket, switch), device carrier with transition cover to the skirting board and carrier profile including fastening material for screwing above the skirting board duct base. Note: The upper parts of the skirting board ducts can be pushed sideways under the transition cover of the device carrier, whereby the transition cover of the device carrier provides a cut-concealing function for the upper parts of the skirting board ducts.