As you are hiding the centre of the bow then I would put a cross stitch in the middle to hold it together. I often use bows on packaging and although glue is ok to hold them together while you are making them, I don’t trust it to survive the journey as the synthetic ribbon seems to want to return to a flat shape and not hold the knot. A stitch or two in a place where it can’t be seen makes the whole thing much stronger.
Sam x