The other suggestion is that since the documentation was written, a new easier way to install MeshCentral in systemd was added. As root, run:

 node node_modules/meshcentral --help

You should see a --install, --uninstall options. So remove the "meshcentral.service" file you created above and try:

node node_modules/meshcentral --install

MeshCentral makes use of HTTPS to authenticate and encrypt management traffic over the network. By default, a self-signed certificate is used for the MeshCentral HTTPS server. That certificate is not trusted by browsers and so, you get a warning message when visiting the web site. You can solve this but obtaining a free trusted certificate from Let’s Encrypt (https://letsencrypt.org/). There are some limitations and so, it’s best to get familiar with this service before starting. You will also need a valid domain name that you own and that points to your MeshCentral server.

Getting started is easy. If you don't have it already, install NodeJS. Then, create an empty folder and do this:

 npm install meshcentral
 node node_modules/meshcentral

That's it. MeshCentral will set itself up and start managing computers on your local network. By default it will be setup in LAN mode and agents you install will multicast on the local network to find the server. To setup the server so that agents use a well known DNS name and to start customizing your server, go in the "meshcentral-data" folder and edit the config.json file. The configuration file must be valid JSON, you can use this link to validate the file format.

Connect to your home or office devices from anywhere in the world using MeshCentral, the open source, remote monitoring and management server. Once installed, each enabled computer will show up in the "My Devices" section of the web site and will be able to perform remote desktop, remote terminal, file transfers and more. Get started by installing a MeshCentral server of your own or if you are not familiar with MeshCentral, you can try the public server at your own risk at MeshCentral.com. You can install your own server on Linux or Windows, it will run on anything from a large cloud instance to a Raspberry Pi.

MeshCentral Tutorial Videos
MeshCentral now has it's own YouTube channel with plenty of tutorials.

https://www.youtube.com/channel/UCJWz607A8EVlkilzcrb-GKg/videos