Plenty of newsagency supplier representatives will have an opinion on shop layout, fixtures and related topics. While these opinions can be useful, they need to be considered knowing the retail experience of the person and their core motivation.
Shop layout and fixtures are changing rapidly. Unless you are actively invested in retail businesses yourself, your perspective may not be current or useful to those being asked to make the investment.
The best advice is that which you can give yourself, based on your own business data and your own retail skills as well as that which you can access from any retail management or marketing group of which your business may be part.