The only thing missing from P11 would be an environment sphere mapped to match the "Equirectangular" mapping of the Cycles BG Environment. The preview sphere is mapped with an equirectangular projection (AKA Mercator projection). But, none of this is really necessary for anything except the preview. The complexity in the template scenes is all for the sake of previewing the HDRI.

The setup below is for P11. There's no magic preview sphere but it will render the same.

For a SuperFly render in P11 just plug the HDRI from the environment dome into the BG Environment node and connect that to the Background root node. Same setup as post above except you don't need the dependencies. You do need the Mapping and TextureCoordinate nodes to make the environment display correctly..

Hide the dome in the scene. Then set the background shader up like shown below. The Rotation input on the mapping node will control the rotation of the background. Remember it's in radians. A value of 0.0, 1.57, 0.0 will rotate the background 90deg. The background will not be visible in the preview. Now you probably see (or really don't see) why I made that template scene for this.

You may want to add a plane at ground level setup as a shadow catcher. The OP scene doesn't look like it would actually need that though.