When choosing or designing and installing shower fittings, two key matters must be considered:
Bathroom space and how to contain the water splashes so your showers don't drench the entire floor and all the other fixtures

If you want a shower cubicle with a base tray, you'll have to choose a base that fits into the area you can spare, while leaving enough room to manoeuvre around the sink and toilet.

Even if you want a "wet bathroom" where the shower isn't boxed into a stall, you still have to consider how much space you have left for moving comfortably about.

Some kind of screen in the form of a shower curtain or glass panel is always advisable, even in the most open of bathroom layouts, to keep water from getting onto everything.

The smallest shower areas can look smart and inviting with clever use of materials and panelling. Clear glass panels paired with flooring that is continuous with the rest of the bathroom floor keeps the space visually open instead of cramped and dark. You could also install partial panelling (on just one side of the shower area) to contain water splashes without causing you to feel boxed in.

Shower trays needn't be a drawback, as elegant, unobtrusive ones are readily available these days. If the ceiling is high enough, you might even elevate the shower tray, with one or two steps leading up to it, to visually increase the sense of space.

If panelling feels too rigid and constructive to you, use the shower curtains instead for a little more "elbow room".