I know you can do a push install to OSX and it should work the same on Linux.
First you'd need to have a user name and password with ssh and sudo access.
For OSX you need to download the .dmg file from ESET Install the application on OSX configure all your settings and export those settings to an .xml file.
In the ERAS, create the push install package with the .dmg you downloaded from ESET and the .xml file with your configuration you exported.
Then just push like you would to a windows client, using the username and password that has ssh and sudo access.
Simple as that.