FYI to anyone out there still thinking about Kam snaps, I just did this! I was tired of drifting apart from my boyfriend in my sleep, lol. I used a Massdrop Ultralight V for my side, and a cheaper Amazon pad for his since we typically only camp together in the summer. There's plenty of sealed material to install the snaps on the Massdrop mat. The Amazon mat was way riskier because the seams were pretty thin, but it was a $15 mat so I was willing to take my chances lol.
It worked great! I'll attach a dorky gif of me moving the mats around with my foot. I might protect the snaps with some seam sealer in the future. We haven't had the chance to test this out yet, but I did roll across both in my apartment and nothing bad happened aha.