I had a feeling you wouldn't go for the glue down hack. I'm not that fond of it either. Note to self: Hacker! hacker!Glue-fix maybe as a temporary visual-impact-only 'solution'. The next time you put a carton eggs there, an RTV glue-up will likely fail. Do It Like You Mean It.
Tangent-- I added some grommets to cheap Harbor Freight moving pads. The smaller ones are just the right width to be correct front-to-back over the third row. Mine lives there full time, under the plastic Honda cargo tray. I added some support cords that hook over the plastic loops in the back on either side, and same up to the shoulder-belt loops for the second row outer. That rear pad protects the side panels up about a foot. The one for the middle seat just drapes over the seats, but has enough to pull up over the rear of the center console to protect it all from cargo. That one rolls and stuffs behind the second-row seats when not in use. Maybe $10-15 for both depending on their sales promotions at the time.
I'll look into the moving pads at HF. Doesn't WeatherTech have a solution for this although I'm sure it costs more than what it protects ...?
I used to keep a moving blanket in the minivan, but I kept finding it in the garage without naming any names.