install shower mixer/diverter

im doing a bathroom renovation and using a mizu 1500 shower mixer with diverter.

im using shark bite fittings and just extending original copper pipe. im going to use isolator taps for hot and cold pipes in case the unit fails.

is there any other tricks to installing one of these?, someone mentioned using non return valves, are these necessary?

it also says minimum water pressure is 7.5 psi or 50 kpa maximum 150psi 1000 kpa should my mains pressure be between these, how would i check

thanks for any help


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