How to Restrict Editor Access on ONLY Homepage

Hi, I’ve researched a little, installed a few plugins but, as of yet, have been unable to restrict ‘editors’ on the website I manage from editing the homepage. I want the editors to be able to do everything included in the role, asides from edit the homepage (I want to restrict them from doing this). I run a multisite with around 10 subsites (each subsite has an editor, I am the admin). I don’t want them to be able to edit the subsite homepage – is this possible to set up? Thanks in advance, Paddy