The iPad has a beautiful display. Many use it to get work done, play games, watch movies, and more. Have you ever wanted to use it as a second display at work to become more productive? These apps and mounts help you with that.
Twelve South HoverBar V3: clamps anywhere to let you use your tablet conveniently. It has an iMac friendly design (depending on which model you own).
Vivo Laptop & Tablet: holds laptops up to 15.6″ and tablets up to 10.1″. The mount is adjustable and features a heavy duty C clamp.
Duet Display: one of the apps you can use to use your iPhone or iPad as an extra display. The companion Mac app is free.
Whether you should use your iPad as an extra display is up to you. The above products let you pull it off though.