Running pipes to bowl

[blueboy1920]

Hiya.Fitting a bathroom nxt week.There havin a shelf with a bowl on top & tap to the side fitted to shelf.The tap has flexi pipes to it which are around 300/500 mm long.Im running the feeds between the stud wall and was wondering which is the best way to connect the pipes,as i dont wanna fit the connect the flexis behind the wall,or is this acceptable(leaks)?...Or is it better to pin the flexis around the inside of the shelf unit and connect to feeds from wall under the shelf with isolators ?
Thanks for any help 😕

 

[oldplumber]

replace flexis with cu tails is safest method, service valves are preferable, never join a flexi into hidden pipework esp as they a prone to failure

 

[blueboy1920]

Thanks oldplumber.Did think it was not to be done because of faliure of pipe.