Not necessarily. In a single domain forest your size, there are no meaningful downside to having all FSMO roles on the same DC. There is an argument of splitting them to provide more resiliency, but tbh. considering that you can transfer/seize roles if needed, this argument seems a bit contrived. The primary considerations revolve around making sure that PDC Emulator has access to an external time source (but this should apply to other DCs as well considering that you might want to transfer this role to others at some point). Also note that the Infrastructure Master role becomes irrelevant (all DCs should be Global Catalogs)
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hth
Marcin