And no, I don't think you should tape over any door seams:
SourceHow does GoldenRod® work?
GoldenRod® heats to a surface temperature of less than 150 degrees (which is almost too warm to hold) and circulates warm, dry air throughout an enclosure on a 24 hour basis. This increases the temperature of the air inside to several degrees above the ambient outside temperature. Expansion of the heated air forces the moist air outside through the vents or loose fitting doors leaving the dry air inside. In order to work correctly, it is important to ensure that there is adequate ventilation.
Bolt it down good and build a cabinet around it for concealment.
Maybe keep it off the concrete with a rubber mat or metal spacers if you're concerned about rusting the bottom of your safe. I used these and my buddy used something like this.