Can I hang 4X emonTx via wire on one emonPi/Base?

[Also see the “US split phase monitoring requirements” thread, separated from this thread to keep both linked discussions on topic - Mod]

Working on a pretty massive setup. For now I’d like to do 16 channels on one hub and 6 more with an emonTx connected to an emonPi. I’d prefer to use wired connections; am I right that there are only two radio channels for the Tx’s? Is this feasible?