MoCA does not require a switch like most wired ethernet today. It is a bus architecture where all the nodes operate as independent units. Routers provided by some cable/internet providers can function as a MoCA to wired ethernet bridge but it only serves as a link to other wired ethernet devices and the internet. It does not function as a MoCA switch. MoCA doesn't need a switch. The router is just a link. The Premiere 4's can function as a MoCA to ethernet bridge, a link, just as you want to do. So yes, it will work.
3 Premieres w/2TB each