Use one plug at a time. Many people have low batteries. Using one plug at a time allows those afraid to ask the opportunity to use one.
Plug Into One Outlet At A Time
It is good internet etiquette to use one plug at a time because using multiple plugs discourages customers from patronizing an establishment.
Using multiple plugs at a Hotspot prevents other customers from using the wireless service for various reasons. Patrons may feel uncomfortable asking to use a plug when someone is using two.
When customary services are unavailable at Hotspots customers go elsewhere. Patrons who use multiple plugs make themselves and the hotspot look bad.
Using one plug at a time if you have multiple devices to charge is reasonable. Sharing plugs with customers who need them is great.