If anyone is interested, I just had installed a 4-channel (4 dash cameras) dash cam on my NX 300. Can be done on any vehicle including sedans as long as you have a sealed window on the sides of your vehicle and not covered by the exterior mirrors.

I bought two 2-channel Thinkware U1000 4K dashcams. Set to 2K for 60 FPS as you will capture more licence plates in motion.

Lockdown Security in Markham, Ontario, Canada supplied the hardware and did an amazing installation.