Dash Cam for Ford E250 Econoline Camper Van: Mounting Rear cam?

Novice: I have never owned a dash cam.

Taking my 2001 Ford E250 Camper Van on a 4500 mile road trip circling America. It is time to add a dash cam, especially for this monster adventure.

I am seeking suggestions for a dash cam:

• Local microSD card
• App connection (Bluetooth if possible)
• Considering a dual (front & rear view) cam but....

Concerns about rear cam setup that will NOT interfere with rear van access nor can be easily knocked off:

• Assuming a rear cam is mounted internally, but where? Since I actively (frequently) access my gear through the rear van door, I am concerned wherever it is mounted it will easily be knocked off.
• Is it possible to have a rear-cam have a wired connection?
• How should rear cam be properly threaded through the cabin of the van?

Thank you