Thank you @Alexandre. Yes I can't wire from Appartment 1 to 2, but they are split by a wall only. Now with a simple repeter I can reach 330 Mbs from apartment 2 but only near the wall where the...

Can I create a mesh network starting with a Deco M4 wired to the fiber router and extend it with a set of 3 Deco P9 connected wireless to M4 unit?