I'm looking to get a nice keyboard tray for my sit-stand electric desk. I've been looking at the iMovr Trackless, iMovr Stowaway, and the iMovr SteadyType Exo. These are all really expensive but if they're actually worth it over something that's worth $100 or $200, then I'll splurge. But I also have some questions:

Is more than -15 degrees negative tilt ideal? The iMovr website says they have research that shows it is. How important is an independent mouse platform? Are these really worth the price? The SteadyType exo has up to 85 degree negative tilt, which is more than the other two. But the other two have Independent mouse platforms. Also ideally I'd like one that can be stowed away, but if the extra negative tilt is really worth it, I can sacrifice that. Plus the exo is super easy to install/uninstall which is a bonus.

Overall I'm Not sure what to make of them. I'm worried I'm gonna spend too much money on something that isn't worth the extra $100-$200.

Any opinions?