Ohhhhhhhh, that's a good price, I would get some of those if I could.
As for what Tim said about electricity and water, no water ever gets on the pad. I never water after putting the seeds in anyway, as soon as they have germinated they come out of the propagator.
Of course I would never advice anything that might not be safe so if you think it's not, please don't do it.
Watch for pictures of my electrified tomatoes hahaha, they may even glow in the dark.