I installed a DR750S-2CH in my '17 hatch a couple weeks ago. I used the Power Magic EZ and routed the wire up the driver's pillar (not one-time use) and in the headliner to the camera. Cable for rear cam went in the headliner and down the passenger side of the headliner to the back. The panel in the back inside is a PITA and require some screw removal by the seat back. I also removed the trim panels on the lift gate as well as the rubber hose that holds all the wiring and ran the camera wire in the same tube for a nice clean install. The rear cam cable I ran through the split where the liftgate trim panels meet so there was no drilling/cutting etc.
Wish I had taken some pics when I did it all.
Let me know what you think of the 900. I heard of overheating issues with it which is why I went with the 750 instead. Although coming from my GoPro Hero 4 Session I'm really not pleased with the video quality. It's way over sharpened. 1080/60 on the DR750S looks like crap next to the 1080/60 the GoPro uses. Might pull it all out and sell it and get the Viofo A129 Pro Dual instead - video quality is so much better.
Here's a comparison, GoPro first then the DR750S.You can clearly see how much worse the quality is on the DR750S.
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Here's the video (starts at 10:01) showing the video quality comparison between the Thinkware U1000, DR900S and A129 Pro.
The A129 Pro is also half the price of the DR900S and I haven't seen anything regarding thermal issues with it.