New GT Owner

Hi folks, I bought a 2024 GT with 2400 miles a few weeks ago. What a great car! Can you answer a couple of newbie questions please?

Of course, I’m paranoid about the dreaded ICCU issues. The service manager told me not to preemptively replace the factory 12v battery, just wait until the OEM battery failed. Do you agree?

I bought a Bluetooth battery monitor. Will permanently attaching it to the 12v battery cause any power draw issues?

Thanks so much! I’m loving this car!