Is it possible to have multiple administrators, each with their own admin link?
Per PollUnit there is only one admin link.
If you created a PollUnit while logged in, the admin link should be disabled for others. So even if they know the admin link, they can not access admin feautres and data. You find this setting in the admin tab »Make admin link accessible to others«.
You can use organizations to share admin rights with other users. Read more here: https://pollunit.com/en/tutorials/organization
Hope this helps.
How do I find the admin tab?
When visiting the admin link you see a big box on the top of the page. Here you find the following tabs: Participant link, Invite, QR Code and Admin link. The last one contains the setting you are looking for.