Non CL CR TPV rooms are on floors 6-11 (not 4-6).
Personally, I would request “upper floor first preference, north/MK side of building second preference” - or something like that.
While any TPV room at CR is a good room - no matter the floor or location on the floor - generally speaking the higher the better when it comes to views, in my opinion. Being on the north/MK side of the building also gets you away from the Chef Mickey’s side of the building, which in my opinion can be a tad noisy (and that noise drifts straight up the atrium).
We stayed at CR several times when mine were that little and I recall a few early bedtime nights wishing they’d stop that darn Chef Mickey’s song/dance!
Don’t overthink it too much since everything I said above is relatively minor / not critical to an enjoyable CR stay. Just small observations.
BTW, DW and I enjoyed many a night watching fireworks from the balcony with a nice beverage while the little ones slept. It’s one of the best parts of staying at CR. There’s a channel on the TV that plays the fireworks music, so you can turn it up a bit and crack the balcony door and it makes for a decent way to watch the show.
Enjoy your trip!