Mantle Mount and In Wall Subwoofer Install

Mantle Mount Fireplace TV Mount with a LG 55" C9 OLED TV
Above the Fireplace Mount MantelMount MM540: amzn.to/2SdQYC9
LG C9 55 OLED TV: amzn.to/2PHa3ey
8K HDMI Cable: amzn.to/34K3kVn
We added the sub as a 2nd sub for the Klipsch Reference 5.1 system: amzn.to/2Txy3CT
In-Wall Subwoofer: amzn.to/39xNEYz
Subwoofer Amp: amzn.to/2v24KPc
Google WiFi: amzn.to/3azLnfy
The wireless sub that comes with the system in in the back of the room.
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[@tempstep4058]

It says in wall subwoofer install. But you don't show how you did it.

[@yiujun4066]

Would you know how much is the clearance between the wall and the TV when pulled down?