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Your project doesn't sound like a full UI replacement, and just a handful of frames comprising an addon. In that case, you don't need to set the CVars or scale UIParent; you are only concerned with the frames themselves.
AFAIK, if the parent frame is sized and parented correctly, child frames will adjust properly. It would be in your best interests to use frame sizes in multiples of 2 for the parent in that case, because you mentioned (correctly) that odd numbers like 3 will mean the children will be off-point. You can use math.mod, math.fmod, or % to fix that.
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