For rather static overlays, a 1Mbps up is bare minimum.
We recommend 15 Mbps up. General rule, the faster, the better.
Unmetered internet is a must-have.
In addition, avoid Wifi connection and do not use blootooth headphones/mics, as it maybe subject to interference.
Good call.
Yes, ethernet provides a more reliable connection, especially in the early morning (~sunrise), when most people (especially avid gamers ;-) are sleeping.