Tacho question

I know I don’t come under the multi man rules and classed as single man

I was under the impression that if there was 2 men in the cab and my card was in slot 2 and on poa this would be used as my break. And if I had 3 hours on poa I could have a 9 hour daily rest and this would be instead of an 11 hour daily rest.

If my poa doesn’t count towards having 3 hours off would it be best to leave my card out of the machine all together while the other guy is driving and if it gets to 3 hours then show that period as on bed?

My View is if its not counting for anything then why should I be putting it in slot 2 in the first place?

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