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Should be fine. If I were you I'd weigh the books, add an extra 25% on top to be safe, and then work out how many of your chosen fixings are rated for that load.
Personally I prefer wall anchors to the toggle fixings you linked to. Main reason is the toggles need huge holes drilled, which are then harder to fill later if needed. Also more chance you'll hit some metalwork behind the plasterboard that you hadn't realised was there.
There isn't too much detail on the listing for the shelf, but it does say max of 15kg and mount on solid walls, so do double check on the shelf itself. 15kg isn't that many books, I don't think.
Is this mounted onto drywall with this as a bookshelf asking for trouble? There are a lot of books so am imagining two rows of two of these side by side.. I think the studs in my flat are metal (at least, I've run into something I seem to not be able to drill through) and I'm not 100% sure how to drill through them, or whether it's advisable to do so - I think metal studs are pretty thin?
Also taking suggestions for any sort of book storage that will go on top of some Ikea hip-height cabinets, thinking of something like the Billy to just sit on top of them, but not really feeling the Ikea veneers..