Intruder Alarm 's untapping is a triggered ability, so if you have two of them, yes, you can let one of the triggers resolve, then do something at instant speed (like tap a creature), then let the other trigger resolve to have creatures untap again.
Just remember that creatures typically have summoning sickness, so if you cast a creature and it successfully resolves, you likely can't use any tap ability (abilities where is part of the activation cost) on the same turn.
August 16, 2019 1:22 p.m.
Really..? Damn.. my opponent got thraben... so i'm really fucked up that time then...