Not safe for celiacs. High chance of cross contamination as your tacos are grilled next to glutenous food.
If you aren’t sensitive I guess it is worth a try.
Safety
How confident are you that this establishment takes safety precautions against cross-contact?
— Not very
Quality & Quantity
Is there a gluten-free menu?
— No gluten-free information on the menu
How much of the menu is available gluten-free?
— Most/All
How would you rate the taste and quality of the gluten-free food you tried?