AS you've been hearing, it's perfectly acceptable to use more than one conditioner, in fact, it's usually a good thing to spread out the overall distribution as inferred. Separating digital sources such as CD players/transports/processors from analog such as pre-amp/TT or anything "non-digital" is also a great idea. Plugging amps directly into the walls, sans conditioner, is usually/often the best way to handle amplifiers as many conditioners can be current-limiting when peak demands are made and can sometimes flatten dynamics.
I currently use 4 conditioners in my dedicated listening room including a dedicated 10 line breaker box (7 dedicated 20 amp lines for 2 channel, 3 dedicated 15 amp lines for the home theatre which will be integrating its own separate electronics into the room "someday when I'm ready to do it" and the other 2 (15A's) for lighting/A/C -heat, misc). The (7) remaining 20Amp lines all feed dedicated outlets for amps only, analog only, digital only, subwoofer and "other" (such as electronic crossovers, etc) only. I also use an MIT Z-center for the digital, an MIT HC (high current) for my pre-amp only, a Furman 15i for one of my crossovers, and the whole room is exclusive to a dedicated Abet 2201 whole house conditioner.
So, don't be reluctant to mix and match and use your ears to decide what works best. Good luck.
