I wanted to share a little tool call rtox which is mainly a wrapper for tox which delegates all executions to another remote machine.
I use it daily because my main machine is a laptop and I always find much faster to run tox on a remote machine that has better CPU/RAM/SSD.
Shortly, when you want to run remote you just add [r] before tox.
I hope you will find it useful.
Cheers
Sorin