There is a view in pdfToolbox 12 which is a merge of views known as “Bleed area” and “Page border” in previous versions. This view offers the possibility to define the width of the security zone, which wasn't available yet.

Depending on the entered values, the security zone is updated and the result can have either a highlighting inside (like the current “page border” view), inside and outside (like “bleed area) or just outside (new possibility), as shown below.