Bunnings sells two different SMC shower bases (both 900 x 900 mm): 3-lips (Mondella) and 4-lips (Estilo). I was wondering when to use 3-lips and when to use 4-lips shower base. For a 3 panel slider shower enclosure (for example the one here https://www.showerama.com.au/our-range/showerscreens/200-series-2/), which shower base should I use? Cheers.