Power conditioning for multiple dedicated circuits

I have been looking through the discussions and cannot find specifics on how people condition a dedicated circuit. I ran 4 new lines to my music room. There are two wall receptacles where I removed the tab on each to have each outlet on the duplex a dedicated circuit. I have my amp, preamp and phono stage plugged into 3 and a monster power center plugged into the 4th to cover all other items(subwoofer, DAC, streamer, turntable power supply).

All the conditioners I am finding are similar in design to my Monster where there are 8+ outlets. Are there any single outlet models for my application or would I need to allow space to stack up multiple units only utilizing one from each?
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I would be remiss if I did not mention if an Electrical Contractor/Electrician was hired to install four 120V branch circuits he/she would not install MWBC (s). The reason is the NEC requires all new 15A and 20A branch circuits supplying outlets, per 210.12 (A), shall be AFCI protected. The problem with using a MWBC the 2 pole breaker will nuisance trip for no apparent reason because of the shared neutral.

Example of a 2 pole 15A or 20A AFCI breaker:

NEC (National Electrical Code)

210.12 Arc-Fault Circuit Interrupter Protection.
Arc-fault circuit-interrupter protection shall be provided as required in 210.12 (A), (B), (C), and (D).

(A) Dwelling Units. All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices installed in dwelling unit kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas shall be protected by any of the means described in 210.12(A)(1) through (6).

To add to my last post. If a duplex receptacle is split and the two receptacles will each be fed by a separate branch circuit NEC 210.7 shall apply. (It doesn’t matter if one is fed from L1 and the other from L2 or both circuits are fed from two breakers that are fed from the same Line (L), leg.

210.7 Multiple Branch Circuits. Where two or more branch circuits supply devices or equipment on the same yoke or mounting strap, a means to simultaneously disconnect the ungrounded supply conductors shall be provided at the point at which the branch circuits originate.

Shunyata Research makes the Hydra Alpha 12, has 6 separate zones and is capable of delivering 20 amps of current 
I hope you ran all four outlets to the same leg on your electrical panel. If not, do it.  You will be pleasantly surprised, and all it takes is to switch the breaker around. It is not even necessary to  remove any wires.  Just pop them out and re-arrange them.