Monitor 4 wall mounting

Anyone have suggestions for mounting the monitor 4s on a wall? I have seen the clamping bookshelf mounts, but I would need mine to tilt down a bit and the monitors are heavy, so I would be concerned about them slipping out over time. Maybe there is one that clamps front to back, or has some kind of stopper on the front?

I did notice mine have 2 holes on the back that the previous owner must have added, with metal threads inside. Not sure what kind of mount you would use for these:
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Answers