Kriat Shma Sheal Hamita

What if one says Kriat shemah al hamitah when putting a young child to sleep? Do they say it again later?

A – If they say it without Bracha they can be yotse with that
Q – And can one say it at shul? Or does it have to be at home /close to the bed?
A – You say it right before getting ready to sleep
Q – Without a beracha means saying Baruch Hamapil without mentioning “Baruch ata HaShem”, correct?
A – If you say it this way before you go to sleep its ok to be yotse with the child if your going to sleep soon