thanks bro.An RTX 2060 will run 3 monitors. You will need to balance details and frame rate for each game to your liking. An RTX will certainly not run full details on the most demanding games. It all depends on when is the minimum level of detail you will accept before you say this doesn't look good enough.
I am running an RTX 2070 on a triple 1440 system and think it is fine. I would certainly like more power to run more details and frame rates however the performance is ok for now.