Its quite a simple job once you've watched a tutorial , not too much trim needs taking off either.
I earther mine to one of the M10 bolts you can see in the glove box area.
I tucked he wire in the A pillar & roof liner
Theft wise, its very unlikely you'd get it stolen, I have a Nextbase 622 in my Golf R haven't ever worried about the dash cam getting stolen, unlike the whole car 😬