We need to make a housing which should have strong permanent magnet, so the housing can be fixed underneath any metal surface.
When we pass 12 volts DC to that housing, somehow it should be dropped down. Which means either we need to put some electromagnet to demagnetise the effect of permanenet magnet for few seconds, or we need to use some other technique to let the housing drop.
Interested candidates should first submit the concept or drawing. once idea is approved, project will be awarded.
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I already have a design made. I can make the magnet stay and when there is power applied the magnet will drop. It's simple physics really and I have the circuitry made.