I have rented from Fox but in Miami. They have a reputation for trying to force you into buying their daily insurance coverage, if you don’t need/want it, be firm when saying no.
They also tend to rent vehicles that are much older then the top tier rental companies. The Expedition we rented was 4 years old and had over 100,000 miles. They will very thoroughly inspect the vehicle for damage prior to the rental and even more so after. Since the vehicles are older there is lots of damage that needs to be noted. Make sure to speak up if you see something during the pre rental inspection. Because of the pre rental inspection it takes about 30 minutes to get your car once you are being waited on. We were lucky when we got to the rental location at 10 PM and were waited on right off. There was a 3 group line behind us when we finally left since there was only one employee processing rentals.
At least in Miami their rental location was well away from any of the other rental companies. Be sure to include the time for the return inspection and shuttle trip back to the airport when planning your return to LAX.
Having said that, we saved a tremendous amount of money, over $1000 cheaper then Hertz, using FOX and would rent from them again if the price was right.