Having the spa at +18” on the far side of the pool will allow the spillway to flow towards the house for visual and sound effects. This helps with masking the sound of the loud road noise. When the spa is located on the house side of the pool this allows for a blind side of the pool due to not being able to see around the spa when it’s being used.
According to the design you have 1 bubbler on the second step, is that correct?
If the location of the skimmer and auto fill are on the house side of the pool they become hidden from view at the house.