Guessing the ones in the middle are ceiling detectors!
DT yes but I wouldn't personally put a smoke in the garage either, save it for the hall, a heat or RoR seems more appropriate in the garage.
Lounge and Bed PIR is facing a window but if mirrored optics less of an issue.
Landing deffo needs one two, otherwise its up the stairs during the EE timer, into any other bed and
gone again all before you even get an alarm... As I guess the hallway will be on Access.