Ok let me see if I can explain a little better. The e-marine mounting kit I use as shown in photo
comprises two flat ally plates which clamp with two U bolts each to the vertical safety
rail stanchions. They can be mounted on the outside of stanchion as in my installation
or the inside as shown in the photo
The ally plates are designed to protrude about 2" above the top of the stanchion with pre-drilled holes to take a further U bolt each, used to clamp the horizontal mounting/pivot pole. Here again you have a choice of mounting this tube on the outside or inside of the ally plate. This means you have four possible mounting scenarios.
I have mine mounted with everything outside the stanchion which thanks to my rubbing strake & the fact that the safety rail stanchion supports are well inboard, keeps the stowed panels inboard of the outer edge of the hull. Also the plastic covered safety lines fitted through the top of the stanchions remain in place slightly below & inside the pivot pole.
You will find the balance of the panel on the pivot rail rather extreme if you use other than the default pre-drilled location as shown in the photo. You may also find that telescopic support poles are too short as well if you use the e-marine kit. I understand your reasons for not wanting them intrude on the walkway when horizontal though, so the choice is yours.