Disklavier

Anybody has experience with Yamaha MSP5 or JBL LSR25P powered studio 
speakers? These have similar footprint, weight, capabilities and 
cost. I like the MSP5 except that its on/off switch is in the back 
panel. Intuitively it seems, one located on the front panel is ideal 
for Disklavier applications. Any comments? 

Yamaha MS20S has the power switch on the front panel but overall 
speaking slightly less desireable than the MSP5.

Incidentally, can we set these 16 lbs. speakers on top of an upright 
Disklavier?

Any feedback is appreciated.