Front system with insulation ect. (Astra F)

Hi, I’m reading shcon here for quite a while and I always hear different opinions about how much bitumen mats you should use per door. have a 5 doorr Astra F. 10 or 15 pieces per door? The mats of Sinus Live are supposed to be. there you know what you have. and the next question: which front system can you recommend? I hear a lot of rock/metal and sometimes techno. I’m once pinned over the Sinus Live S-LF 165. What I like about the only 44m m installation depth. not that afterwards the disc does not go down anymore Since they are in contrast to eton etc. but about 100€ cheaper I wonder if they are so good tonally then. So then go into the keys greeting and already thank you in advance Tobi edit: The radio is a Becker Monza. Think that can be kept without hesitation.