I have been wondering about the same thing. One idea I've yet to try is getting a non-baby-feeding product that will be useful some other way in the future, such as double-sided suction cups or something similar.
One product that I've been eye-ing: Schildkraut Shower Suction Holders. They come in a set of 3, in different sizes, and look like I could stick them between the bottoms of my cheapo Ikea china and the tray of my less-cheapo Fisher Price highchair. When my kid has a better handle on self-feeding, my dastardly plan is to use these suction holders in the bathroom or kitchen as soap holders or maybe ... sandwiched between the lid of my laptop and the keyboard so it stays shut and reduces any temptation to go online shopping for babygear gimmicks as I am wont to do in the wee hours of the night. (J/K I'm too addicted to the internet to go that far.)
If there's anyone on here who's tried this product already, please report your results before I order on Amazon! Thanks!