I used marine Tex myself, overkill and word to the wise, don't use a bunch or you will have some rock hard lumps that are a major PITA to sand down to deal with, just a dab and before it dries you want to use a putty knife or similar to flatten it out. I learned that the hard way.
I don't recommend silicone because nothing sticks to it.
And yes, they should come with 3m sticky and it sticks quite well, after doing many in the past with weldwood, which made a bit of a mess if you aren't careful, I really enjoy the 3m mats.
You sure Jet-Trim offers them with 3m backing? I ordered some recently and the option was not available. They do seem of high quality stitching etc. I went with black mats, white carbon fiber piping for the edging w/black stitching. Considered going red stitching but didn't want to make the mats too "busy". My project is a long ways from installing these but couldn't pass up the black Friday pricing.
They do make turf. They don't push it you kinda have to ask them about it. It's they're non-skid material with a closed cell foam backing. Those layers get stitched together and then there is a border sewn in as well.