Do I need to provide a hotel booking on arriving at Customs

Hello

To be elligible for the 144h Visa Exemption, I need to provide a Ticket onward, and the proof of a ticket to a third country within the 6 days.

What about hotel reservation ? Do I have to provide a proof of booking or a an adress where I am staying ?

If yes, Is it necessary for all the nights or just the arrival one ?

Thanks in advance.