Get it printed in PETG or ABS and it will be fine.I finally got my CGF last month, but it's still sat in the box. I would be interested in a wall mount but don't have a 3D printer. I'm also looking at the tray but the online retailer where I got the CGF from doesn't stock it, and it's a bit steep to buy alone from anywhere else that might stock it. I have seen that there are 3D printable trays out there, but for something that would be inside of the unit, subject to any heat from the unit and NVMe drive, and being plastic, I don't particularly like the idea of something melting or failing/falling apart inside of the unit.
Even PLA has a glass point of 60C, I’d expect even that will be fine. (PETG is more like 85C and ABS is over 100C)