We love going to the Audi Quattro Lounge. They have a great chefs table. They don't have a lot of items in the menu and the only gluten free item are the street tacos. The chef's table does have some gluten free items but they are not listed so you have to ask. I did ask them to put a GF on the labels. We will see if it helped at all
You only get access if you have home plate or dugout box seats. If you go right when the gates open there's usually plenty of seating. If you wait until closer to game start time it can be difficult to find seating.
It's definitely worth checking out if you have access. It's also really cool to walk around down there and see the players walking around. It's quite the fan experience.