Hello Tan Han Lim,
Thank you for your question and for reaching out with your question today.
When configuring LAPS you can deploy it to whichever DCs you would like it to be functional on. This would have been carried out in your environment at initial setup and if LAPS requests are accepted by multiple DCs, I would assume that LAPS was deployed to all of your DCs. In my experience, I would deploy LAPS to only my main DC as having it on multiple DCs can cause issues in an environment.
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Best regards.