Automation of successive Notes installs

I have to install Lotus Notes on multiple computers. I have to install Notes 8.5.1, then the latest Fixpack. I’d like to merge them into a single install package, so I don’t have to do two successive installs on each machine, but I can’t find any documented way to do that. So I’m thinking of automating the installation of first one then the other, maybe with a batch file. Has anyone tried such a thing? Any ideas how best to accomplish this? Thanks.