Why not just repurpose one of your two MacBooks to be a personal device you use at work? Does your work require a VPN or a profile that allows them access to your data? If so, then this might push me to get a work machine.
My work does. So I'll bring my MBP to work as a note taking machine, a means of communicating with my wife, and a note taker, but all work is done on a work provided XPS 15 because it has to be connected to an Active Directory to work with the code and the servers provided for the job.
I can't imagine trying to decide to use three machines or not. I find I'm happier with less devices but each device has its purpose. One iPhone, iPad, and MacBook. I would never want two MacBooks, two iPads, or two iPhones.