I picked this up with some other parts locally, I have not seen it mentioned here at all. It is shown in a catalogue of Crossfire options that I have but cannot find.
It is very handy and I use it to keep a folding box in position in the trunk. The four corner blocks have Velcroİ on the bottom and attach to the surface of the carpeted tray.
Under the tray is the OEM trunk mat, under that is a spare set of OEM interior mats and under those mats is a another spare OEM trunk mat which has never been used and possibly been there since two trunk mats were installed by mistake, who knows?
There is a Chrysler tote that was offered separately to go with this option and is offered for other vehicles as well. the mat fits the Crossfire trunk very well and was obviously made for it. The carpet has a raised lip all the way round the edge, maybe 1/2” high.