Is a baby supposed to move 10 times an hour every hour of the day?
The 10 times per hour thing is a recommendation for your kick counts. You are meant to do your kick counts during a time when the baby is active (as you say, mostly in the morning and at night). So for approximately one hour during that time, you count, and if the baby doesn’t move 10 times during that span you should tell your doctor. So, no, not every hour of the day. Choose a time when the baby is active and when you can lay still and pay attention. Much of the other times of the day the baby will be sleeping, so you won’t feel him/her move at all.
