The size and the layout of a whirlpool bath predetermine it to a particular use. When it comes to smaller and more versatile models, its use may be very wide. The smaller the bath is, the more options of its use are there. For example, you can place it in a smaller room or on a balcony, thanks to its low weight.
For your inspiration, take a look at an example: the Puerla whirlpool bathtub placed on a balcony or on a terrace. Most of small or middle-sized whirlpool baths can be placed anywhere on a terrace. Thanks to the fact that the weight is laid out evenly on the whole surface, its not too havy to be carried by the slabs.