What I have commented on is that I personally use only 8 remotes per target as my personal limit. I based this off of other devices that produce 8 frequencies in parallel without issue in practice, and from my own observations both personally and those who are in my remotes.
I tend to keep no more than 4 remotes in any killing modality, with the rest in support/healing modalities. I find this to be well balanced and not pushing to fast.
As the others above have stated, this is going to be largely a personal decision based on what you are attempting to do and how much you can personally tolerate.
There is no hard rule that you can only use X remotes.
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