Lots of feeders have dual SDRs, one receiving 1090 and one receiving 978, on a RPi. There are several threads talking about how to set it up. I’ll see if I can dig one up for you.
Starting off with a single receiver is probably the way to go so you can learn and optimize your physical configuration. After that you can start playing with different antennas, optimizing your gain, and other stuff.
Welcome to the hobby. You’re going to both love and hate it.
This is old, but as far as I know it should still work: