Site security fence & trench right along it

[WWilts]

Trench for services likely to run very near site boundary/ security fencing. At very top of pic. 

What kind of site fencing, if any, would allow that?

Edited April 12, 2021 by WWilts

[TonyT]

Heras?

[markc]

Heras will be fine with Ledgers and bracing to stop it falling over or sliding into the trench