The pigeon-hole unit is available as an option and can be placed directly on the surface of the desk or wall mounted as shown.

上面的“鸽子洞”储物格可以直接放在桌子表面，也可以挂在墙上。

youdao

Plus, with in-built Orientation Sensors, the main unit can detect horizontal or wall mounted (vertical) placement and initiate Smart Equalisation to optimise sound performance.

ENGADGET: blogger-avatar

There's a second alternative: A growing number of New Yorkers are going for duct-free AC systems that involve a small, wall-mounted indoor fan powered by a separate outdoor unit the size of suitcase.

WSJ: Ugliness for All