Naim CD5/Flatcap2 - can they be stacked

Wondering if I can stack the CD5 on the Flatcap. If its safe to do so, any downside in terms of sound quality? Trying to free up a shelf on my rack.

Thanks, Samir.
naim reccomends that the cd and power supply be sited on different shelves,however my cd3.5 sets on top of the flatcap and sounds great.
Thanks. I'll give it a shot.