Obviously, whichever reader we use, the surface will always be more susceptible to glare than paper. Since my laptop has similar issues, I have found some things that have helped me.
1) I normally have my lamp/light to the side of where I am working and/or reading. This keeps it from reflecting on the surface and minimizes the problems.
2) I have discovered that the more light that is available, the fewer the reflections as well as the easier it is to read using e-ink technology. This is particularly true when I have lights available from multiple sources.
3) By using a small led clip light (to the side) in rooms where I normally have a problem with glare, I have noticed that the glare disappears.
4) Of course, reading outside in the sunshine is the nicest solution - but we can't always do that - too hot, too cold, too wet, too windy.
Anyway, I am still experimenting ... and would love to hear other suggestions concerning the ways others handle the same issue.