Hello! Was reading that it's not a good idea to take fat burners and pre workouts together due to stimulants. How would I take both then?

I have Nutrabolics Supernova that I've taken for a long time, 1-2 scoops 15 minutes before workout.
I also am going to try Nutrabolics Thermal XTC which says 10-15 minutes before a workout. What should I do? Thanks!