Large 1300ft Garage needs cooling -- do I need multiple head units?

I have a large 1300 ft garage with 16 ft ceilings, that I believe I am going to cool with a 3 ton mini-split unit. it's all one big space, no walls. what are the advantages of having multiple head units.. for they are pricey. Is using two any better than just one.. if I leave the mini-split always on?

https://preview.redd.it/rxjlomujhkof1.jpg?width=4032&format=pjpg&auto=webp&s=e903aad2cb8456f4ce23eec7cb294914c6f772d5