Keep in mind scapes like these are not long term tanks. They bring the available plants to a competition and set the tank up then add plants. They are taken down within a day or two.
Notice how the moss trees completely block out any light for plants undernsath them. With moss being such a slow growing plant, those plants wouldnt be there at all with the darkness. It would also be nearly impossible to keep the algae growth out of the moss with it being that close to very powerful lights.
That being said, number 3 and 4 imho are the only ones that would work. If you wanted number 3 then it would be better to just take a picture of the countryside. So it it were me, number 4.
However, given the choice; i would skip the tree and do a large moss wall fovering the back of the tank and put some rcs in that would love a moss wall to bits.
