Sonos Era 300 Manual page 22

Choose the orientation
Upright wall mounting
Mounting the speaker upright is suitable for
most locations.
The speaker can swivel left or right, or tilt up
and down.
Inverted wall mounting (upside down)
Mounting the speaker upside down is
recommended if the speaker is installed within
2 feet of a ceiling to optimize downfiring
sound.
The speaker can swivel left and right, or tilt up
and down.
When wall mounted upside down, the power
cable can be routed from above or below.