Tony, you really should provide ridgid support for the plumbing. If youy look at the back side of those ball valves, you will see they are tapped for (4) screws so that they can be hard mounted. I am sure with a bit of thought, you can come up with a suitable rigid mounting board or bracket to accept the valves.
As for the siphons... I would guess you could do it either way. Balancing (2) siphons will certainly be harder than (1).
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