Shower tray with angled rim around it

[ashwell]

I am currently doing a new build requiring 2 shower trays to use as walk in showers. The tray I currently have does not appear to have angled rims around the edges so water constantly pools at the sealant and doesn't run into the tray and drain. Can anyone recommend d a tray that does have angled rims, even if the angle is small or does this not exist?