Could you expand on this? How does this work?
You install Jump Desktop Connect on your Mac. This tool enables the connection via the Jump Desktop Servers to your Mac. It is a concept similar to something like TeamViewer (but with a totally different use case). More details about the connection: https://jumpdesktop.com/connect/
Would implementing the Fluid Remote Desktop connection reduce the security profile of my computer and network?
Any door is a door. But I think this is quite a well-guarded one, if you use a strong password. And you have an easy way to control the access: if you close Jump Desktop Connect on the Mac, nobody can connect. As long as Jump Desktop Connect is running, only the configured user can connect. With Jump Desktop Connect closed, the door is not only shut, but the door is gone completely.
Do you think this would work with an Eero mesh network?
One last question - how does a VPN figure into this? Does Jump Desktop’s Fluid Remote Desktop connection work as its own VPN?
I am no network technician, so I do not feel comfortable to say too much on this one to explain the differences. Fluid Remote Desktop uses encryption, TLS in combination with DTLS. The advantage of a VPN is that you do not need Jump Desktop’s servers in order to connect to your Mac. The disadvantage is that you need to setup your own VPN service on your network. The Fluid Desktop connection is a connection that uses encryption from one end to the other, so this is similar to a VPN. But it is not a literal VPN.
Should I use - or avoid using - a third-party VPN (example - Nord VPN)?
If I am not mistaken, a VPN solution like Nord VPN always is a service that enables you to access the internet in a secure way if you are on an untrusted network or if you want to disguise your country of origin in order to access services that are restricted to certain regions. If you want to VPN into YOUR network, you need to have a VPN service on YOUR network, so that the end of the VPN tunnel leads into your network. Some routers have the ability to setup your own VPN service. I just found this article that explains the concept: https://sumac.com/how-to-setup-a-vpn-to-access-your-office-files-remotely/