Presently I don’t think 2 of the same module+firmware are possible. However, if you had three white whale modules, you could communicate concurrently if they’re running the different firmwares (WW, Orca, Kria).
Brian has a solution for expanding the number of modules that can be TT connected which should be available soon. It’s also totally possible to DIY your own cables - they’re standard 6pin (2x3, 0.1" pitch) ribbon cables. Premade ribbons are probably already available for purchase somewhere in the diy electronics web universe…