Gypsum panels (vertical lines) were glued and painted on the wall (where the TV was supposed to be). To firmly fix the bracket on the wall, you need to make a flat surface.
кронштейн на гіпсовій панелі
We try on the bracket and cut out the relief. But it is quite difficult. First of all, you need to prepare the room. It will be very careful, but everything should be covered with furniture film.
A wood cutter was made from a handy tool that was available. With the help of a cutter and a screwdriver, we drill circles in a plaster panel. The spaces between the circles are broken with the help of pliers.
місце для кронштейну у гіпсовій панелі
When the required area is cut out, try on the bracket. Probably, the bracket will lie deep and you will need to put something under the bracket (for example, a fiberboard plate, or even several layers).
In our case, we did not have enough 1 mm for the TV mount to be fixed on the bracket. So we added washers to the screws at the back of the bracket panel. This was enough for everything to work as it should.
The plaster panels are painted, so we painted over the drilling site so that the white color of the plaster is not visible from some angles.
This is not a 100% good or correct option. But this is our experience of how we installed the bracket and other fasteners on the relief panel using a handy tool.