Most traditional roll-tops have a curved or rolled edge although some may include a flat tap platform at the end or in the middle to accommodate the necessary fixtures. Some tub models are designed to fit on the wall at one or two edges, while others sit quite independently. If your bath remains in close proximity to the wall, you can also choose to attach your fixtures there, which gives you the option of concealing the plumbing.
You can view types of bath/shower mixer kits on numerous websites such as www.shopwiki.co.uk/Chrome-Modern-Bath-Shower-Mixer-Kit-Pegle
Photos of baths with assorted showers that may inspire you can be found at www.google.com.mx/search?q=roll+top+bath+shower&hl=es-41
You can search "freestanding shower towers” for products like the one displayed at www.trendir.com/archives/000101.html
You can also investigate wall-mount shower towers that could conceivably be adapted to free-standing with custom fittings. See examples such as "the ravishing new Ramor Thermostatic Shower Tower from Triton - a masterpiece! It consists of a glass shelf, a fixed shower, a handset shower, body jets, diverter levers and above all - lots of beauty. It offers a choice of five different showering sensations…” at www.qssupplies.co.uk/Triton/Triton_tower_showers/BrandCatego
Styles and materials vary from basic to elaborate, as do prices, but the options are virtually limitless. A patient search will ultimately result in the perfect shower for your space, and a sybaritic bathing experience. Don’t forget the candles!