Mailbox + Post installation help

Going to install a mailbox for the first time:

https://www.homedepot.com/p/Architectural-Mailboxes-Centennial-Pewter-Extra-Large-Steel-Post-Mount-Mailbox-950020P-10/308974492

https://www.homedepot.com/p/Architectural-Mailboxes-Steel-Mailbox-Mounting-Board-Black-UMBS0B06AM/322390037

https://www.lowes.com/pd/Postal-Pro-Cedar-Products-Red-Cedar-Wood-Mailbox-Post/1000228491

Can anyone tell me if these will work?

I am looking for a Cedar Post. The mounting board is most likely needed to fit on the post. Just not sure if this is all compatible with the post at all. If anyone has any other similar cedar posts that do work, what are your recs? Anyone else set one of these up before?

Thanks