Dennis, it'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered. A moderator can give it a more generic title any time you'd like to suggest one.
This is a case where I'd very strongly recommend you forget the foam tray and create your sloped mud bed with deck mud to perfectly fit your shower footprint and drain location.
While the foam trays can have some advantage when your shower footprint and drain location are designed to fit the available tray and your subfloor is perfectly level and flat, they just don't make sense in a situation such as you have. You can also save a good bit of money using the mud shower floor and have a better floor, too.
My opinion; worth price charged.
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