shower tray lip

Evening, I've got myself in a not-so-ideal scenario. Bathroom is 1.8m wide, I've a shower tray which measures 1.8m so it's going to go wall to wall. I have studded the wall using small 200mm batons (I could have used dot and dab but that's where I'm at). I'll be using tile backer board and...

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...