If you purchased the Modern Spare tire kit for the Tesla Model Y, you know there's no great place to put it.
It also doesn't fit under the factory trunk boards without making them uneven, or the trunk won't close.
My solution uses two 4"x36" foam therapy roll off Amazon. https://www.amazon.com/gp/product/B071RRMQMD/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
Print the two foam supports and they slide over the rear trunk wall and hold the foam in place. The end result is the floorboards stay flat with this solution with exact amount of room underneath it for the Modern Spare tire kit.
In order for the trunk door to close with the floor boards laying flat, you need to trim 2.75" off the rear most floor board. Pull back the fabric backing, cut it off, trim the fabric, and use spray adhesive to reattach the fabric off the newly exposed piece.
The author hasn't provided the model origin yet.