Thank you Tony, as per my (trusted and experienced) electrician solid core wires aren’t usually used in domestic circuits (almost here in Italy) and he is firmly convinced our final decision above mentioned is the right compromise according to my components needs, code compliance and general safety aspects.
I already have used 1 dedicated line since 2 years, it has 2,5 sq. mm wires at 16A-220V. Just one common (non audiophile) outlet with a P20 feeding my entire system, amplifiers and subs included.
It always worked fine and it makes me presume how my future plans can improve from this point on.
If any other EU or Italian member on this forum has more experiences to share with us, will be very appreciated.