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Ok so I tried it but couldn’t get the usb drive to read despite it mounting successfully and an hour of fettling. Might be a formatting issue (possibly Apple FAT32 ≠ Windows FAT32) but I don’t have a PC to hand to test that. The usb drive is getting quite hot for some reason, and I suspect you’ll need a reasonably decent processor in the router to cast to several devices simultaneously if you do go down this route. DLNA from my NAS to CCA works fine using mConnect in case that’s helpful.
Edit: I’d be tempted to try upgrading the router it and if it doesn’t work out I’d add a headless micro pc (or a Mac mini) to the mix as a dedicated server.
I looked at it but (for me) it was more or less redundant as I already had a NAS set up. That meant I could support multiple DLNA clients both inside the house and also whilst on the move.
I imagine you could also look at upgrading your router - for under £100 you can have a wifi router with a USB 3.0 port that can share your files across the network.
Apple really f*cked it up removing the optical out on the ATV4; personally I'm pretty sick of their strategy of locking out the interesting hacks you can do with some of their kit for no reason other than to flog you an overpriced and under-specced consumer product. I'm looking at you, HomePod.
CCA's are good value if you want cheap multi-room audio.