You don’t need to add this plate separately
the Adoorn In-Ground Post installs in your lawn or similar ground material
Adoorn's 41 inch Surface Mount Post bolts to concrete or solid ground for a rustproof
Our standalone Surface Mounting Plate adds rock-solid stability to any post mount mailbox setup
then match the size to the mailbox you own
Locking Post Mount Mailbox | Large show-address-modal You don’t need to addNamed Architectural Digest's Best Mailbox, Adoorn's Locking Post Mount is built for mail delivery at the street or curb, roomy, secure, and made for everyday ease. The Large model is the high capacity large mailbox for households that get a lot of mail. It holds 7 to 14 days of mail and fits magazines, catalogs, and small parcels up to 16" x 10" x 2" without forcing your carrier to fold anything. Locking, weatherproof, and powder coated for the curb.