I took it to replace the router to cover an apartment of 70 squares. In principle, one module is enough, but since I took 3, I installed all 3. Now there are no dead zones at all. After the ate (immediately after installation), secondary modules began to periodically fall off and the main one rebooted. Communication for a month with the support service did not lead to anything, except for the advice to roll back all the settings and set up the network again. After this procedure, everything began to work. The modules are friendly with each other, but the main one, once a day (at least) is rebooted for unknown reasons.
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