Nanit Pro mounting height

Hi all, trying to install today. Installation guide has a very specific (and kind of odd) 66" height from floor to mounting bracket. My crib is set next to a window, and have to go about 2' lower. I'm wondering if that will alter how the camera can assess sleep?

I'm not wanting to pair the camera and start the subscription before I need to, but I can't identify if the camera will be too low without pairing.