Thanks for posting, just did mine over the weekend using a different video and can confirm those screws in the back are a PIA. I could barely even see the one back by the tube, had to put the screwdriver on by feel. I did not disconnect the battery, I think you're only in danger if you just let the airbag panel drop down hard or kink/snap the line. According to Newtis guide, if the filters don't have a tab, it gets installed with the arrow pointing towards the back seat. If the filters have tabs, they point towards the front of the car.
https://www.newtis.info/tisv2/a/en/f...ilter/1LfjIG2k