I used to work for Line-X and we did Jeep tubs all the time.
First. I recommend not doing it. Let’s more heat in. If your shows are wet/muddy/snowy the floor will be slick. It’s a bitch to clean unless you hose out the Jeep. And most off the shelf liners look horrible.
Second of you insist on it. I would have a professional shop do it. Like Linex-X. Yes it’s more expensive. Yes you can do it yourself but not to the level the pros can. Also, there is a reason why you can’t buy Line-X at auto zone or Walmart. And Line-X can be sprayed in any color and has a lifetime warranty.
Another option would be spray the floor and reinstall the carpet. That way you get the best of both worlds.