Grommet-mounted power modules are a great way to go if you have the available grommet hole in the same diameter as the power module you’d like to buy. There is no such thing as a “standard” grommet hole size. It tends to vary by desk manufacturer, and some even offer different size holes on different desk lines.
Most common on standing desks are 3.0″ (76mm) or 80mm on larger desktops, and 1.75″ (45mm) or 2.25″ (57mm) or 60mm on smaller desktops. Some that we’ve reviewed here get as large as 4.7″ in diameter. Of course if you’re making your own desktop it’s simply a matter of having the right drill bit.
For other methods of supplying power to the equipment on your standing desk, look at our full roundup of power management.