My Racor 900 primaries serve a valve manifold that serves 2 Detroits, 2 generators, a boiler and a diesel stove without fuel starvation issues. Each diesel engine has a secondary filter and the appliances have a small inline filter. The Racors have 2 micron elements that, you would think, should increase the chance of fuel starvation but doesn't. Because I keep my tanks clean, the 2 micron primary elements go 500+ hours.
Shared primary filters and individual engine secondaries is the usual setup on ships and big boats.