My thoughts:
1. The Blackvue DR750X-Plus is truly Blackvue's best dash cam ever. It uses the latest Sony STARVIS sensor that even outperforms the DR900
2. Look into the Blendmount and attach it to your rear view mirror stalk...great option
https://blendmount.com/aluminum-das...900s-dr750x-dr750s-bbv-2000r-standard-series/
3. You should have no issues with heat on the latest Blackvue models. Heat was an issue many years ago on a specific model. I live in FL and it gets VERY hot here too and I have had zero issues with the DR750 line of cameras and I have installed many
4. No one is stealing dash cameras. There is an LED that flashes when in Parking Mode that can be turned off through the app to draw less attention to the camera. With your ceramic film, and the natural tint built into the front windshield, it will be very difficult to see anyway from the outside looking in
5. You most certainly want to use parking mode. Set the camera for 12.0 or 12.5V and you will be just fine. Most all accidents happen in parking lots. I had a DR750S in my 2019 Limited and it sat at the airport for a week at a time and never an issue with starting my truck upon return
6. You may want to look into replacing your truck battery with a H8 series since they will fit in the RAM if you plan to install additional electronics for greater peace of mind, but not truly necessary
If you have any additional questions, I am a dash cam and vehicle electronics expert and happy to talk via cell if you want to PM me.