LOE Tasks in Project Server

What is the proper way to reflect LOE (Level Of Effort) tasks in MS Project?

For example, adding a task showing the PM working 10% of his time on the project, for the duration of the project. If we simply give that task a duration equal to the project, then Project cannot determine the correct Critical Path of the project. In addition, if the project duration changes, the PM will have to manually change the duration of the PM task. If we try linking this task with SS and FF relationships, the duration remains 1 day unless we input the duration, in which case we still have to update the duration as the project progresses.

I have tried creating a hammock LOE task by copying and pasting links to the first and last tasks, as described in TenSix Consulting articles https://tensix.com/creating-loe-tasks-in-microsoft-project/ and https://tensix.com/more-about-level-of-effort-tasks-in-microsoft-project/ . However, this does not work in my version of Project Professional. I am only able to link either the starting date or finish date, but not both.

Does anyone here have experience with scheduling this type of LOE task in MS Project? We are using on premises Project Server. We want to schedule this type of PM oversight task to plan for the estimated hours of PM time over the span of the project, have the task duration update dynamically if the project duration changes, and be able to status this PM task during the project to reflect the "actual" and "remaining" hours for the task as the project progresses.