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Or maybe « two Raspberry Pis 4 »? It feels weird to have the plural mark on the model number

In English, it would sound strange to say "Two Raspberry Pis 4", idiomatically we would probably always say "Two Raspberry Pi Fours"

Ok! thanks for the clarification

“Raspberry Pies 4” is arguably correct, if you consider 4 to be a postnominal adjective. https://en.m.wikipedia.org/wiki/Postpositive_adjective

But it’s weird enough that I would only use it when being jokey.