My solution above seems to be holding up. Here's the velcro dots I purchased: https://www.amazon.com/Fantasyon-Ad...&pd_rd_i=B09HTSL3NL&ref_=pd_bap_d_rp_1_t&th=1
Edit: I placed the rough "hook" side of the velcro to the back of the mats and then stuck the mats to the carpet on the back of the third row. No need to stick the other half of the velcro to the back of the third row.
Here's the placement I used on the back of the mats (notice the red line. I needed to move the bottom row up to where that red line is. If they are too low like in the pic, they can't grab onto the carpet on the back of the third row):
Edit: I placed the rough "hook" side of the velcro to the back of the mats and then stuck the mats to the carpet on the back of the third row. No need to stick the other half of the velcro to the back of the third row.
Here's the placement I used on the back of the mats (notice the red line. I needed to move the bottom row up to where that red line is. If they are too low like in the pic, they can't grab onto the carpet on the back of the third row):
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