Looks fine. BlackVue never used to come with the hard wire kit so check that out.
For what it's worth, the Thinkware F770 that I have has been impeccable for ... 7 years now(ISH) in 3 cars. I chose it over the BlackVue and it looks like Amazon has them on a limited time deal. If you want to save a few quid I can hand on heart say it has been amazing. Caught two incidents which saved me a lot of headache.
Never had battery problems and parking protect works great. Just about to wire it into the E43.