Depending on how big your crowd is, will determine the amount of Harissa Oil you want and how much Burrata you plate.
Two of us have eaten this for dinner and we have served it to guests prior to a pretty substantial meal. Get the freshest bread you can, go rustic and rip it up into chunks for fun.
Carb counts for these types of appetizers are a bit tricky. The bread is dependent on your product, and probably has the most CHO.