Starting with next update of avast! there is a feature "silent installation" in it.
It works like this:
- you will install avast! on single machine and fully configure it to meet your needs,
- you will choose "create silent installation" in enhanced user and selects folder of avast! installation files (probably some network share),
- some additional files will be created in selected folder,
- you can start avast! installation on other machines from selected location and it will be installed with your configuration.