I don’t see why not.
I would go to different churches and chapels whenever I had the opportunity to go to Adoration. I would sign in when I went.
I wasn’t registered with any of the parishes where I went. I would just go whenever I was able to go.
If you want to sign up for a regular hour at the church closest to your job, you will probably see a sign-up sheet in the church when you go.
There should be a contact number for those doing holy hours. You could probably call the person in charge, whose name is listed on the sheet, in order to sign up for a particular day and time, if you wanted to do that.
Or, you could call the parish office and find out who the contact person is for Adoration in that parish.