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No problem, it won't have an impact.
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If possible, try to install it as much as possible, so that it is easy to repair and maintain. Moreover, the bigger the house, the more it should be installed.
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It is best to add a valve indoors, which is easy to use and more practical. The valve of the corridor well room is not easy to use, if possible, it is recommended to install a good quality ball valve in the room.
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Installing a master water valve is certainly the best. Because in the future, if you replace the faucet or overhaul some other water pipes, you may need to turn off the main valve.
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As long as the valve at the door of the house is convenient, it's fine. If you've got it done, don't dwell on it anymore.
The boundary wall between your kitchen and bathroom is a shear wall, and it is estimated that the hydropower master does not have a water platform drill, so it is easy to go around from the outside.
If you don't open the water pipe, you are willing to go to the top, maybe you will break the waterproof, and then redo the waterproofing, or take the air duct next to it, and walk the open pipe, but it will be a lot of trouble when wrapping tiles, and it should be opened for reference, and the economic loss is minimal, don't talk nonsense if you don't understand.
If it is a steel pipe, it can be repaired with electric welding, and if it is a PP-R pipe, it can be repaired with a quick coupling.
There is a spray gun in the bathroom, and there is a water stop valve at the water source of the spray gun, if not, you have to press it.
Try not to change the water and electricity after the waterproofing, otherwise the new water and electricity slotting part should be redone waterproof.