These mounts can hold 20KG or more, I don't see a problem 6KG at all, especially since you can always tighten the bolts in the articulating parts further if you are having issues.
I have 42" screens hooked up to similar mounts with VESA adapters you can tilt and swivel them with ease and they stay put.
I have 42" screens hooked up to similar mounts with VESA adapters you can tilt and swivel them with ease and they stay put.