The positives, the hole spacing for the screws with which the holder is attached to the TV match fit.
At first glance, the holder makes quality a very good impression and also appears to be very stable.
The negatives, as well as any available port on the back of the device is covered by the base of the holder and can thus no longer be used. Even the connection for the power supply of the TV is no longer accessible.
Although according to the manufacturer, the holder with the LG 55LB674V to be compatible, that is definitely not the case.
We will have to look for another bracket.