" Dampness ... Before buying it I need to know if they can work if they are placed on the floor and not below (I think you can place below the floor for the way Canadian/American house are built) ..."
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Yes, they will work from the elevation of the position they are placed. AN-7CV2D - you can place it in the position below elevation of the lowest floor - in the whole in the ground surface - the best elevation is on the level of the base of fundament of your house (outside of your house). In such case Neutralizer must be placed in the sealed container and the connection to grounding point must be protected against moisture. Also, Neutralizer need to be aligned horizontally.
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One neutralizer for dampness AN-7CV2D can be placed in the central location on the basement floor and need to be grounded to electric grounding point. This one will cover your whole house area.
Or for your house we suggest to have a "Total Home Protection" set. This set provides protection against dampness (includes mentioned above Neutralizer AN-7CV2D).
Set of Neutralizers provides total defense against any Cell-Towers, Antennas or other EMFs from surrounding your house plus dampness elimination.
If you have Cell Tower near your home, you are living, eating and sleeping in wireless microwave radiation. These radiations are continually. Even if you don't have Wi-Fi, chances are that those microwave radiations penetrating your home if a close neighbor does. MicroAlpha products provide ultimate EMF protection filtering harmful parts of EMFs so they become harmless.
https://www.microalpha.com/dampness.html
https://www.microalpha.com/total.html
