Don't just run the cable under the rubber seal. Take the time to remove the B pillar cover or use a pry tool to carefully guide the cables under the trim.
Pick up the Thinkware Q800PRO 2-CH rear camera connecting cable you have routed along the headliner with the power cable and run it along the A, B, and C pillars. Remember, don't just push the cable under the rubber seal because it will create a little gap that might prevent the door from sealing properly - you will get wind noise, or worse, water can seep into the car. Take your time to guide the cable under the trim - remove the B pillar covers and use the pry tool to carefully tuck the cable underneath the panel covers.
When you get to the rear windshield, route the cable along the rear windshield headliner until you get to the rear camera. Plug the connecting cable into the rear camera and power your car to turn on the dash cam.
If you haven't done so, download and install the Thinkware Cloud app on your smartphone. Once your Thinkware Q800PRO 2-CH is powered on, press the WiFi button on the front unit to switch it to WiFi mode and then connect to the dash cam using the app to check the angle of the front and rear cameras.