They have a small sheet of fabric for sliding that you can purchase and put under couch cushions or mattresses to hold them in place. It's kind of like the non slip backing of a rug.
I've tried the grip shelf liner between them, rug tape, but nothing holds. I can't "tape" anything around the mattress/box spring as there has to be room to tuck in t...
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is it a platform bed? velcro or bead of caulking along edges of platform mattress & box springs? heavy duty velcro between the mattress & box springs
https://www.wikihow.com/Stop-a-Mattress-from-Sliding
They have a small sheet of fabric for sliding that you can purchase and put under couch cushions or mattresses to hold them in place. It's kind of like the non slip backing of a rug.
Try placing the rubber cabinet liner between the mattresses. It should helP grip the two so they don’t slide.
How about Velcro on the bottom on all sides so if you turn it it will catch on any side