I plan to parallel nine Orion-Tr 48/24-16(380W) Isolated Converters to feed a total load of 120A. Could any potential issues occur, or will uneven current sharing arise among these parallel units? I will tell the manufacturer to supply all converters from the same production batch when placing the order.
Here’s a link to the data sheet. Seems to say pretty clearly unlimited units can be connected in parallel. By the way. I just copied and pasted your question into Grok and got a link to the datasheet. It took me like 15 seconds. 
As far as other concerns, there are smarter people than me on this forum that will hopefully see your post.
Thank you very much for your assistance. I’ve heard some say a maximum of 3 units can be operated in parallel, while the official website states unlimited parallel operation is supported. I’m confused about which is correct, so I hope professionals can offer clarification.
I think the limitations will be your input source. I can’t find anything official in the Orion manual but the recommendation by other professionals seems to be you are limited to 50% of your input. So if your source is rated to put out 200 amps, for example, you should limit the converters to a total of no more than 100 amps. I have seen others I trust on this site and other places recommend this.