Car camera to recommend for e60 to catch/deter vandals?

hi guys,
Car was vandalised 2 times in a month by vandals. What is is the best solution, 2 or 4 channels? Does it come with power and that can be interchange easily for 24 hours surveillance without jeopardising car battery? What is the Brand that is good to go with and the estimated cost like?

Any advice appreciated. Thanks in advance!
AE
 
Using Iroad v9.
Front n rear cam with park mode recording. Power can be set to cut off if reach certain voltage to protect battery.
 
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