Shower Trays with Tiling Lip

[It's me]

We are planning to fit a shower tray in place of the current bath. I believe that you can buy trays that have a lip that goes behind the tiles to create a water tight joint. However, all of those that I can find have a flat top, on top of which the tiles sit. Does anyone know of a make of tray that does have the lip?

Thank you.

James.

 

[Madrab]

Look for trays with an upstand