Plumbing a Vanity Basin / Mixer Bar Shower and Toilet

[Andrew Gordon]

Guys a bit of advice required on a plumbing issue.
Take a look at my sketch.
I am Piping a Bar Mixer Shower / Vanity Basin and Toilet.
My question is the placement of the Double Check Valve.

Key
B = Bend
T = Equal T
F = Flex Hose
DCV = Double Check Valve
E = Emergency Shutoff Valve
IV = Isolation Valve

Question is my placement of the DCV and Emergency Shutoff Valve is this right?

 

[Madrab]

Place service or ISO valves as close to the appliance as you can, each appliance ideally has their own. Not sure if that's you emergency shutoff valves. Are they all feeding from a balanced supply, if so then check valves not really needed and shower will probably have its own.