2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

I have exactly 3 security cards. Do I activate both this card's "1 of your opponent's Digimon gets -12000 DP" effect and "place 1 of your opponent's Digimon face down on top of their security stack" effect?
Yes, that's correct.
Ruled Mar 28, 2024
My opponent checked my security when I had 4 security cards, and this card was flipped over. This card's <Security> effect activates, but is my security stack considered to have 3 cards?
Yes, it's considered to have 3 cards. Cards revealed by a security check are not considered part of your security stack.
Ruled Mar 28, 2024
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