My Wife and I have limited space in the storage section of our couch.  I decided to create a solution.

I measured the items that we usually have by up on the couch and created the bins in the tray accordingly.  I have included STEP versions of the file to be edited to fit your needs.

The cup holder adapter is fitted to my couch, but can be edited to suit your couch, or cupholder.

The lock bars slot into the adapter to keep it from falling out of the couch if you have bastard cats like I do. once the adapter is installed then you attach the tray with 3 M5 screws.

there is an option for heat set inserts, but the threaded version has been holding up quite well for over a year.