Just use a terminal multiplexer to split your screen (so you don't need a separate tab), and then ceate an alias/session file with your monitoring programs so you can call it with a single command.
Like @muhyb@programming.dev, I too use btop and nvtop, and this is how it looks like in zellij:
I don't know if there is a unified tool for that but I use btop and nvtop side by side. I don't really care but if there is one, I'd like to know as well.
I don't know what GPU you have, whether it is AMD, Nvidia or Intel, but if you use Nvidia, the standard tool is nvidia-smi (if you install the proprietary drivers from here with the optional cuda package, you can access the command) . You will need to combine it with the watch tool for real time info.