You should be fine unless you having streams with very high bitrate (like all streams together approaching 90ish Mbits).
If you are having issues on your network you can just use a compatible 1000Mbps USB dongle (though tops out around 300bmps because USB 2.0 ports), which shoudln’t cause issues as you do not have any local storage attached to the Vero. Also wireless AC is an option if you have a stable one at your place that (hit or miss as always). But except very few titles there should be no issue from a pure bandwidth point of view.
For setting up SMB properly on Synology and the Vero 4K look here (or opt for NFS if that suits your usage case more):