Is there a required/recomended height range for the emergency spa disconnect in a commercial installation?

If the location is deemed readily accessible and it complies with the height limitation set forth in 404.8(A), it should be acceptable.

What about Florida Accessibility?

I am not sure accessibility would really be a huge issue. You should have room for a side reach (9"-54"). Most pool gates would not have that access since the latch is usually on the inside (over an obstruction) and the gate swings out. I am not sure how a wheelchair bound person even gets in the pool fence.

Having an electrically opened gate with an asccessible switch sure seems to defeat those 53" high latches.

How about an area for rehab? I think 6'7" is a bit high.