I see nothing "wrong" with having several, {I've done it}
as long as it is understood that are always included in
the combining algorithm and don't get discarded. AFAICT
At least in 4.2.4p4, they are never included in the combining algorithm.
If one ignores some complications due to local and PPS clocks, the
first peer found (I'm not sure if the list is sorted at this point) is
the only source of time used. Any redundant prefer peers are excluded.
clock_combine only appears on the branch that is executed when there
is no prefer peer.
The other big effect of prefer is that candidates that have better
metrics than the worst prefer peer are selected, although I think this
is only significant if there is PPS peer that would otherwise have been
rejected.
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