The Extra Large Flat – Tall Magnetic Flight Stant is the right height and strength for the Tesseract Vault.
For a basing magnet, use the Large Thick Flush-Fit Base Magnets, 6mm x 2.6mm. You will want to use 1 magnet if you transport the base separately and 2 if you transport the model on flight stand on the base.
[Buy Product=gw-flush-fit-base-magnets-large,variant=39439165882452]
If you would like a base with holes preset for magnets so the magnets can never pop out, use the 120mm oval base with magnet.
[Buy Product=bases-premagnetized-warhammer,variant=30427499921492]
For a flat bottomed base, use the Self-Adhesive magnets for an easy no-drill option.
[Buy Product=flexible-self-adhesive-magnets,variant=32934330728532]