“Adhesion Trap Hole” works against “a monster or monsters”, so “Adhesion Trap Hole” does NOT target.
When “Cyber Jar” is activated, you may use “Adhesion Trap Hole” against all monsters your opponent Special Summons in face-up Attack Position, but “Adhesion Trap Hole” has no effect on any monsters your opponent Special Summons face-down.
“Adhesion Trap Hole” cannot affect monsters Special Summoned face-down with “The Shallow Grave”, “Morphing Jar #2”, etc.
If a monster affected by “Adhesion Trap Hole” is flipped face-down (with “Book of Moon”, etc.), “Adhesion Trap Hole”’s effect disappears and the monster’s ATK is back to normal.
“Adhesion Trap Hole” halves the original ATK, so if you activate another effect that alters ATK, halve the original ATK first and then resolve the other ATK-modifying effect.
If a monster affected by “Adhesion Trap Hole” is then equipped with “Megamorph”, only “Megamorph”’s effect applies.