Samsung's newest mid-size tablet is probably about to get more appealing for the tinkerers out there. TeamWin has announced official TWRP support for the Samsung Galaxy Tab Pro 8.4. The popular custom recovery can be downloaded from the official directory in several forms right this minute.
There is a ZIP file that can be flashed from the current recovery, which is probably easiest as long as you have the necessary access. An image file can be installed over ADB, but many Samsung owners use Odin for device management. An Odin flashable TAR is also listed on the TWRP page.
As usual, flashing recoveries is an action you undertake at your own risk. Don't blame us if things explode.