Dell OptiPlex 5270 All-in-One Setup And Speci?Cations Manual page 9

Articulating stand
NOTE: The stand comes assembled in the box.
2 Set up the keyboard and mouse.
NOTE: See the documentation that shipped with the keyboard and mouse.
3 Route the cable through the stand, then connect the power cable.
Basic All-in-One stand
Height Adjustable stand
Set up your computer 9