VESA monitor stands

I have just bought an LG 27BK550Y monitor. I needed a desk mounting stand with clamp because space is limited so I looked for a cheap one on Amazon, it said it was VESA compatible, but there is a 12cmx12cm recess in the back of the monitor which the bracket is just a little too large to fit into. I dont want to order another mount without first checking that it will fit into the recess. Also the hole centers are 10cmx10cm.

Thanks for any advice.