The POLE Slim adapter plate is used to subsequently expand a POLE Slim stele for a Wallbox eM4 Single to include a second Wallbox. The adapter plate is made of sturdy sheet metal and is color-coordinated with the stele and the Wallbox eM4 Single. The adapter plate is screwed precisely to the body and the identical adapter plate of the POLE Slim stele using the included mounting kit and then serves as a stable support for the second Wallbox.