The Alva TT can be placed on any stable, even surface apart from other devices that emit a large amount of heat or possess a high-powered Transformer. This is because the electrical charge emitted from these units may interfere with the direct drive of the TT.
Placing the TT next to a device with a high-powered Transformer (such as the EDGE A), would not cause any issues, however.
If you are unsure your chosen location would cause issues, please contact us at support@cambridgeaudio.com for advice.