I see people do this al the time. Lay it on top of the moss. You have to understand a fact about Monsteras. They have a differentiation of labor, so to speak, on where roots grow from, and where leaves grow from. Whichever side is the side where the (stupid stingy) seller cut off your adventitious roots, is the only side you will probably get new roots from. And that appears to be the side you have pointing UP away from your substrate. Roots and leaves are produced opposite of each other. Its this way because Monstera are climbers and they make the roots on one side to stick to and hold onto the support, and the leaves on the other side to stick out and be able to grow freely.
If this stick was mine, I would put the moss in a clear drink cup like a Wawa big gulp with holes punched in the bottom, fill it with very damp but not wet moss, and stick the cutting in oriented the way it will grow naturally. That exposes you entire (stingily given) single node to the substrate and gives it a better chance of being stimulated to make a new root.
But its going to take a LONG TIME. You have already had it 4 weeks. Expect to have it for months before you get this going, if it decides to grow for you
