One PS would be nice.  However, only so many bucks nice as far as I am concerned.  I just have all three power supply's on one 6 outlet circuit breaker, the three power cords connected with bands to keep them together.  I just switch on the outlet switch when I want to use the eventides.  My other  pedals are powered by one 2amp power supply, connected to  different multi outlet circuit breaker along with the amp. When I just want to keep things simple, practicing stuff, I switch on the latter.  Eventide has the nice feature of passing the signal when no power is provided.  As the Eventides are pricey, I just leave them switched off and covered when I am not using them.