It depends because usually startup is when a lot of drives fail but heat will also kill them. This is why usually people are paranoid about turning off old servers because the drives may not spin up lol.
there might be some extra settings based on the operating system, but this is usually good enough.
If you are concerned about reliable power, you can use a real ATX power supply with molex to 2.1mm or 2.5mm connectors to power the enclosures. Do the “green wire” mod to keep the ATX supply always on.
You can power a lot of external drives with one low power ATX supply (350w).