Installing thermostatic mixer shower- please help

Hi,
I am planning to install a thermostatic mixer shower.
I have a combi boiler.
Is it advisable to make a T-joint in the hot and cold water filler for the bath and take the connection to the mixer valve ?
If the above is not right, then could anyone advise how the cold and hot supply to the mixer valve be taken ?
Regards DIY Novice.
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Should be fine. Ensure that hot and cold supplies are at the same pressure, presumably mains if you have a combi.
Christian.
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