Instructions:

Simply duplicate or extrude out whatever edges you want to have instances on and apply the geometry nodes modifier to these edges.

Select what object  you want instanced (bolt or rivet for example, making sure the object is oriented correctly on the Z axis)

Select what object you want the bolts to be alligned to (if you want to allign the system to a curved surface like an aircraft for example)

Customise the scale/rotation/spacing (there is the option to add in random scale and rotation if needed).