Just like their bike mechanics , I wouldn’t trust them to fit a Dashcam ( especially if it’s a new car).*
There will usually be an independent near you . Have a look for Audio / security companies.
i had a black Vue front and rear fitted for same price as Halfords were charging. But it was in a nice workshop by guys doing it day in day out. Not under a canopy in a car park 😁
I have a Halo Ultra with fitting kit I want fitted . They charge £79 for front and £109 for front/ rear fitting. If you are anywhere near Saltash I would recommend Retrofit Southwest
* There are some knowledgeable ones , but it’s not like the barbers where you can wait for the one you want 😂