Not that I use eSATA for any of my peripherals, but I noticed that some Synology models have eSATA ports where other models don’t.
During a tear down of my DS416play, I discovered there’s an eSATA port on the USB 3 module.
I haven’t tested it and don’t have any expansion units to try this with. I would imagine the software has this port disabled, but maybe not.
I wonder about using any expansion units with the DS416play now.