For a table: peel-and-stick
Four 10 inch plates with an adhesive back cover a 20 inch square. Stick them to a small table and it becomes a build table that the builds stay on.
The adhesive is strong and meant to stay. Owners have cut the plates to fit odd tables with a utility knife.
Peel-and-Stick Baseplates
For a tray or a box: stackable
Our stackable plates come loose, two blue and two green. They make a travel tray, a shelf for a finished model or the lid of a storage box.
They do not lock to each other on the underside. One owner expected that from the photos, and we would rather you knew now.
Stackable Baseplates
For a wall: the Play-Up panel
The panel arrives framed and ready to hang, with the hardware in the box. It frees the floor and it puts the build at a child's eye level.
Hang it into studs or with proper anchors. A panel this size is heavy for a single nail, and two owners had theirs arrive bent, which is worth checking before you hang it.
Play-Up Brick Wall Panel