In the case of a merge node, there is no timing issue. It will wait until all inputs arrive, and once they are all present, it will simply produce the output.
Try using this node with these settings in the workflow below:
Do i need to use Combined and Position? I am using Append now and using 3 Merge nodes as I have 11 inputs so i have a 5 and a 6 input merge node going into a 2 input node.