These Aperta Support Plates from IsoAcoustics can be affixed to any support surface to provide a larger surface area for the Aperta stands.
IsoAcoustics has two different-sized plates in their catalog (these and the 200 plates) – I decided to go with the standard-sized ones. Dimensions for this plate is 8.25″ x 6.85″ x 0.1″ (210mm x 174mm x 3mm). The material is steel with a black powder coat finish.
Installation on these is super easy. Double-sided tape is provided to fasten the Aperta Support Plate to the supporting surface, or the plates can be drilled and bolted into place.