Q1: Can I use this card’s Delay effect to place a Digimon card with Pulsemon in its text and no digivolution cards on top of my security stack?
No, you can't. "Top card" refers to 1 or more cards with cards underneath it.
Q2: Can I use this card’s Delay effect to place a Digimon card with Pulsemon in its text that has just 1 Tamer card under it on top of the security stack?
Yes, you can. After you place it on top of the security stack, the Tamer card will become the top card and it will remain in the battle area as a Tamer.
Hacker Pride BT17-098 U Abadin Electronics [Main] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area. [Main] <Delay> • By placing the top card of 1 of your level 4 or higher Digimon with [Pulsemon] in its text on top of your security stack, gain 2 memory. --- [Security] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area.
Hacker Pride BT17-098 U Abadin Electronics [Main] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area. [Main] <Delay> • By placing the top card of 1 of your level 4 or higher Digimon with [Pulsemon] in its text on top of your security stack, gain 2 memory. --- [Security] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area.
Hacker Pride BT17-098 U Abadin Electronics [Main] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area. [Main] <Delay> • By placing the top card of 1 of your level 4 or higher Digimon with [Pulsemon] in its text on top of your security stack, gain 2 memory. --- [Security] Reveal the top 3 cards of your deck. Add 1 card with [Pulsemon] in its text among them to the hand. Return the rest to the bottom of the deck. Then, place this card in the battle area.
ハッカーの矜持 BT17-098 U AE社 【メイン】自分のデッキの上から3枚オープンする。その中の「パルスモン」の記述があるカード1枚を手札に加える。残りはデッキの下に戻す。その後、このカードをバトルエリアに置く。 【メイン】≪ディレイ≫ • 「パルスモン」の記述があるLv.4以上の自分のデジモンに重ねられているカードを上から1枚自分のセキュリティの上に置くことで、メモリー+2。 --- 【セキュリティ】自分のデッキの上から3枚オープンする。その中の「パルスモン」の記述があるカード1枚を手札に加える。残りはデッキの下に戻す。その後、このカードをバトルエリアに置く。