How to fix the socket in a cinder-concrete wall?

Eugene asks:
Tell me please. How to reliably install an internal outlet or switch in a slag-concrete wall? It is a slag-concrete wall. Have to get out with wooden blocks hammered into the wall. And even that doesn't help. They begin to stagger a lot. The "antennae" on the sides of sockets or switches do not help. Nothing to hold on to. “Dissolve” them and the wall rolls down on its sides.
The answer to the question:
Hello! Try to make wells for the rosette, after drilling, ground to “grab” the surface, and then put the rosette on the alabaster.
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