Hi.
Xilium.CefGlue.dll - is usual assembly, so it will be loaded during assembly probing.
Native CEF dlls you can place also in any place, just call CefRuntime.Load(path) before CefRuntime.Initialize or CefRuntime.ExecuteProcess call. Also it is usually good idea to specify rooted path (i got some issues with using relative path, when run it under different environments).
I.e. something:
CefRuntime.Load(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, your_relative_path_to_libcef_directory));