Just finished a project. I've never liked laying the remote on to the layout when I needed to do something else but lived with it for years until I went to the Legacy system. The remote is larger and more complex and I really was against laying down on the layout. So today designed a model I thought might work as a holder. Printed it on 3D printer and crossed my fingers that it would work and as luck would have it, it works great.
Holders can be mounted on the side of the layout and remote will slide into it like a holster leaving the controls open to use if wanted.