What you probably want to do is create a "smart group" that includes the lights and the echo in that room.
Then when in that room you say" Alexa, turn on the lights" and she knows you mean the lights in the room you are in.
However, I personally use a hue bridge and have geofencing turned on, plus I use hue motion sensors at both doors. Makes it easier for me and visitors (plus, safety feature).
No idea if the plus will support geofencing and/or motionsensors, as I don't own one.
In most rooms in my house I did make smart groups, it IS a wonderful feature