question about subscription

[digifoto]

hello,
tomorrow im going to purchase the overdose premium 1 year subscription.
i was wondering, can i purchase today the 24h normal overdose for testing out the features and cheats?
another question, is the yubikey necessary if i use the cheats only on 1 computer?

[YerUseHacks]

Yes Sir,

If you buy the 24h package you'll have access to most of the cheats (H1Z1 packages not included) for 1 full day.

EDIT: You added another question

No sir, You don't need to use the YubiKey. It is an extra.