Quad panel outlet - can I do one circuit on this?

It is better to use two duplexes instead of a single quad for this reason:

With 2 duplexes, you have an improved ability to arrange power cords to mitigate interference and interplay. 

I was able to remove a persistent hum simply by rerouting cables and moving component positions on the shelves.

@ditusa

Does your amp have a cord like this? 30 amps will run my hot tub!

If you had your choice between using 2 20 amp circuit breakers to power a Multi branch outlet configuration involving 2 duplexes, and a single 20 amp circuit breaker to power those same 2 duplexes, is there any benefit in having a second 20 amp circuit breaker involved? This assumes you don't need the additional power.

Because a multi branch configuration is not really 2 dedicated circuits, why not just use one dedicated Circuit breaker to power the two duplexes.  I am planning to remove one of the 20 amp circuit breakers and eliminate the multi branch configuration because I see no value in thie Second circuit breaker being used. Best to use it for a truly dedicated circuit elsewhere.