I'm not familiar with these Magnum products so cannot comment, but the cheap stick on type from Halfords (or cheaper at Wilkinson) seem to work fine for me. I've stuck them on both door mirrors in the outer corners, they give a good view of the side of the car (useful when parking near a wall) and of the lane next to me (useful for motorways etc) for both when driving in the UK and Europe.
Problems, well after a few years the reflective capacity has worn away, easily solved by fitting a replacement, and on frosty mornings they need to be cleaned by hand as the mirror heaters don't cover them.
For several years on my previous car the driver's mirror glass was missing, but with one of these stick on devices the car met and passed MOT requirements.
IMO they are better than the concave sections on some car door mirrors and anyway many manufacturers don't fit these sections to passenger door mirrors.
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