Dash Cam - ideas/suggestions

HI All,

I have two Ducati ( 749 dark and a MTS 1200) and I was thinking to install a dashcam with no display on both as I wish to connect via Bluetooth on my phone. Can you please help me with any ideas/suggestion on:

1 - Dash cam brand and size
2 - Where is the best place to add the brackets
3 - Are there any contra, that maybe would lead to a second thoughts?

Thanks
Carmine