Got this installed today... I may have sworn a fair few thousand times but it's in, it's working, parking mode is working and the car hasn't blown up (yet).
I'm a bit disappointed with the positioning as I couldn't put it centrally due to the plastic housing not being flat so had to put it to the left of the rear view mirror. Like I feared initially there is a small blind spot but there's nothing I could've done - I'll see how I get on with it, the main reason for going for the Viofo was the superior image quality over the compact Garmin Dashcam Mini.
I'd like to say never again to dashcam fitting but I've stupidly volunteered to help my dad install his 😑