What other option you speaking of? Curious, I have a renovation that has about 28 continuous ft of floor to ceiling windows with 2 sliders. Walls are opening and rewire being done. Currently they do t have any along that space, additionally opposite wall space is 35 linear ft of steps off from a 6ft walkway. Only place can think of on that area is in the step riser. Cold air returns are being put there.
You could stub up two RMC elbows and use a threaded hub box which wouldn't require support but for the rest of us a floor box is the only option.
Surface wiring methods would not be prohibited by code, neither would pendant outlets hanging from the ceiling.
That is also an option.
I would never even thought of that one.
I suppose for OP could also put an outlet box into a wide balaster on railing.
Kwired pointed out that there is more than one way to comply with the 6'/12' spacing rule. A floor box is typically the simplest way but yes if the railing had wide hollow balusters you could cut a box into them and install a receptacle that way too.
I like the pop ups, too.
I visit a house occasionally with a railing wall in a living room that does not have a code required floor box and what do you see? Two white extension cords intertwined in the balusters to power a lamp.
