@Alexandre. thank perfect 1 - Yes agree with you i set as Ap and rotuer/modem i left only for lan (so i disable wifi on my router) correct ? 2 - Ah understand so in this way...setting in guest...

I but today a Deco X20 system (3pcs). So i ask some suggestions to set properly: 1 - i have in my house a modem/router with many devices connected in lan... so is better tha deco is set as Router or...