DNX6960 Indash Nav Mic Location

I have been reviewing all the aftermarket navigation threads and they have been extremely informational. I feel very comfortable installing my recently purchased DNX6960 but still have one question.

I haven’t found any information on where people are installing their Mic for the Bluetooth phone calls. I would like to have it hid away as much as possible and was thinking of installing it up in the overhead light section where the factory Mic is. Has anyone tried this? I found a video on YouTube that had a guy installing it in the same place on a Prius. Just wanted to get a few ideas.

I'll post pictures when I am done.