This is what I use too, the nice thing about this is you can use your existing tools natively and you have lots of flexibility in how you want them arranged. Could be split panes in 1 window or different windows in their own session.

For example I have a `monitor` script in my dotfiles at https://github.com/nickjj/dotfiles/blob/master/.local/bin/mo... which for now just splits btop and a dedicated GPU monitoring tool.

If I'm already in tmux and run that script it splits a few tools in a new tmux window but if I'm not in tmux already then it creates a new "monitor" session with the same splits. I also have it assigned to my status bar where if I click Waybar's CPU icon, it "launches or focuses" that monitor script in a new terminal so it doesn't spawn duplicates if I click the CPU multiple times. Basically ultimate freedom in how I want to launch it.