I believe a node is a node, is a node.
and is the part where your leaves branch off almost symmetrical.
This will be 2 things, the fan leaf itself, and in the future, also, off the stem, very close to that node of the leaf, you will see bud sites as well forming off the node.
\ /
\I/ <------node.
\I /
\I/
I <---------node.
I
I would imagine, yes you could supercrop, and top on the same plant.
Other techniques of interest, try searching for FIM like topping, or "Fuck I Missed"
I would probably lean out the 2 procedures over a week maybe so as to maybe not stress the mama too much at one time.
Im no expert, but I just like typing and duplicating others.