2023 230.67 SPD Location and "number of" Question

[tronic]

Hi All,
There seems to be some debate, at my shop any way, about where and when SPD's are required. Take the following questions... How many SPD's would be required on a New Service on Existing SFD that has an 80A Sub- Panel (Sub- Panel is also new and in the basement)? Then the same question when the New Sub is in a detached garage. Finally, when the New Sub is in a Detached ADU?

 

[shortcircuit2]

1 at the service per 230.67 and 1 at the sub-panel per 215.18 or/and 225.42

Service - 230.67

Feeder - 215.18

Feeder is a Feeder... so do not really need the language in 225.42