In-Ceiling Speaker Question

[karaim]

I am installing in-ceiling speakers. I have a few questions.

1) I am afraid that my ceiling (made of sheetrock) won't be able to handl the weight of the speakers. Is there something that I can buy to install inside the ceiling, like a metal plate, to make it firmer?

2) I heard that insulation is good for in-ceiling speakers. What kind of insulation, where do I get it, and how do I install it?

[readonly]

1) It should be fine, because each ceiling speaker is designed for the sheetrock