Looks like a hobby to me.
You could use the three-way splitter then connect the Joeys to the splitter, freeing up the client port then use a jumper cable between the two nodes. A Solo Node would be more ideal for the third Hopper but with the Duo Node at least you're prepared for a fourth Hopper if you ever wanted it. Make sure you have 75-ohm terminators on all unused node/splitter ports and good RG6 on all receivers with decent compression connectors on all ends. Also make sure any unnecessary splitters are taken out and that the necessary splitters are of good quality.
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OK so you have 3H/5J? In that case move one of the Joey pairs to the new node and use the 3-way splitter to add the new Joey. Then use the jumper across the nodes and terminate the free HOST port with a 75-ohm terminator. As previously stated make sure a cabling is good RG6 and has decent compression connectors on all ends. Also make sure the splitter is a good quality splitter (900MHz.)
Your original proposition would work I'm sure but I think you'd have better MoCA signals if you do it this way.
wow.. if I ever run into this at a home I"ll be sure to go back to my truck and drive away very fast.