Have you set up hardware/software to run models locally before? Not that it's incredibly hard, but the cloud GPU providers usually simplify a lot of the steps.
The jump from 1 RTX running a local model to multiple RTX is a big jump that I'd wait to tackle until I was very comfortable with 1. Which might mean you want to do something with more VRAM instead of the 3060.
Starting with 1 card doesn't work for everyone; but you're biting off a lot vs. renting a cloud GPU and it can take a lot of time to get a local setup going for the first time.
