They look like they would work however I would be extremely wary of buying anything from B&Q that they are not actually directly selling as if you have any issues you will not be dealing with B&Q you will be dealing with the third party sellers who are typically a nightmare.
However I also wouldn't buy the ones matty linked to as whilst they're being sold on Amazon they're coming from overseas and IME that can make returning them more awkward, even though it's Amazon.
Those brackets will only be any good as long as you can mount the camera at 90 degree to the viewing angle ….and only good if your mounting the camera internally ….
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