Well, maybe it's not necessary to be so thoughtful, or having to spend big bucks for quality mounts if you just mount the monitors by their factory mount mechanisms. No VESA compatibility required, and monitors remain as adjustable as they were intended to be. Any sagging from the arm mounts can easily be compensated for with the standard monitor mount adjustments.
Step 1: Inspect your factory monitor mount.
Step 2: Take out what you don't need from it.
Step 3: Mount the factory monitor mount to your multi-monitor mount.
