Tipping the caterer

I’m confused on how to tip the caterer because I’ve seen so many different answers. Some say tip on the total bill. Some say tip on the food bill. Others say tip per person.


My caterer includes the linens and glassware in their cost. They don’t bill us separately for appetizers because we’re allowed to pick 4 options to have passed plus a station. They don’t bill for coffee, bar mixers, or cake separately either because it’s also included in the per person cost. I don’t pay anything additional, it’s literally the per person cost based on the meal choice plus sales tax. That’s it. They do not include gratuity in the contract. They’re supplying 7 servers, 3 chefs, and 2 bartenders. Plus they will have their coordinator there.
So I don’t know what to do about it. If I should tip per person, what is an appropriate amount to give? Also, I’m not a fan of bartenders having a tip jar out at weddings. I know it happens frequently but I was planning on tipping them anyway. I just don’t know what to give.