How useful it is I don't really know – but for impact, you can't really fault this Rocket cassette deck shelf.
Rocket is the name of the designers rather than the product (which I think is simply called 'shelf'), but is part of a wider collection based on the two designers' 'common infatuation with rock n roll and disco culture'.
In this case, an 80s-style, in-car cassette deck that mixes 2D and 3D elements, specifically wall vinyl and the wooden 'cassette' shelf. The entire design is around 42 inches wide, the shelf part covering 11.7 inches. Two colour options, both available online for £95.