Use multiple Chrome users to manage and create multiple Facebook Accounts
Logging in and logging out Facebook accounts again and again can make them suspicious for Facebook spam detection bots.
So I suggest you to use multiple Chrome users.
You can create them by going to top right corner User Profile on your chrome.
Click on your User Profile to see all of your users or to create new. Click on Manage People to create new User.
You can create 500 users at a time.
Means you can manage 500 Facebook ids at a time.
Depends on your manpower.