Different automated messages for different property layouts?

Hi,

I have a few apartments in the building, each with its own unique lockbox for key exchange for after-hours check-in.

I've set up message templates and scheduled them to automatically send to each new booking.

However, I can't send different templates to different property layouts.

Is there a solution within booking.com, or a free alternative service that someone can recommend that can help?

Cheers,

Ronnie