Shorten the included power cable so it will reach from the Matrix Portal to the power input once connected without too much excess wire, as shown below a few steps down.

You can also remove one of the plastic header ends and wires from the branch point, since we only need one set of connections.

The printed brackets and wall extrusions mount to the display with M3 screws.

The Matrix Portal fastens on top of a printed plate that orients the board so the buttons can be pressed from the side of the display.

The power cable plugs into the VCC and GND header pins, where the clip can grip to the nubs next to the pins.

Use the included machine screws to fasten to the red wire to the 5V terminal and the black wire to the GND terminal on the Matrix Portal.

The printed diffuser has nubs on two of the sides that align to the two slots on the side of the display.

Press fit the diffuser one side at a time. You can use the two extruded wall mounts to help remove the diffuser if needed.

Now we can use a USB-C cable to power it up and mount it on a wall or set it on a desk.