To install security mount for Reolink Argus series cameras, here is a video for your refenrece:
Install the Security Mount
Step 1. Press the button to release the plate from the security wall mount.
Step 2. Screw the bolts to fix the security mount plate on the wall.
Step 3. Install the security mount on its plate (Make sure the top edge of the backing plate is inserted into the mount).
Step 4. Press the security mount button until its plate clicks into the mount.
Step 5. Install Argus to the security mount, then adjust its direction and tighten the screw to fix it.
Remove the Security Mount
Step 1. Press the security mount button to pull the mount from its plate.
Step 2. Unscrew the bolt and take down the camera.