So you rip gray cover where speaker is? I think you are screwed. Maybe glue them or get other one from Ed Moard or ebay (found one).
I think you should ask us for how to remove speaker first before you start. I guess you learned your lesson.
I have to removed whole backseat for get speaker cover out (3rd brake light) for tint. There is mine.
Believe me. I try that under trunk. Nothing work out so you have to do inside of car. It is not that hard work.