So I just looked at your layout. Is that stub out right next to where you want to put the pad? If its that size all the way from the meter I would think that should work if you get a meter upgrade to support the higher demand. How often do you think you will be running both furnaces, the grill, everyone is taking showers AND you are heating the spa at the same time...
As a general suggestion from experience. Put the pad where you want it, it will be worth the effort to make it happen. The last two pools I was involved with we were never happy with where the builders put the pool equipment. They always put where it easiest for them. And in my house, the one I bought with a pool, I moved the pad 30 ft it bugged me so much... It also coincided with all new equipment too. But I am much happier with where it is. The previous owners..the ones that had the pool built, complained they didn't like where the builders put the equipment pad either.