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At the recent 10th annual roadster gathering, someone gave me a plastic partition for my dash tray which was 3D printed and apparently modeled after a Lotus part. Thanks to that person (sorry, didn't catch your name). I ended up re-designing it a bit so that it fit tighter and also made a version that includes a phone mount. See pictures. I'm also attaching STL files (zipped because it's the only way to upload them here) in case you have access to a 3D printer.
When using nav on my phone, I've always found it a problem that my phone slides left and right in my tray, as well as toppling over when I accelerate hard. I haven't found any other phone mounts that I wanted to attach to my dash. This one works well for me and it is adjustable.