The most difficult part of such a configuration is latching and locking.
If you want to be able to open both doors at the same time and for the doors to latch when closed and be able to be locked for privacy, it is necessary to install operating rods that control a latch bolt at the top and/or bottom of the doors either on the surface of the doors (cremone bolts) or hidden inside the door stiles.
These devices are very expensive. The photos you posted are probably of staged mockups advertising something in the photo and do not reflect a real bedroom double door set.
Q
Geanite is same as mine
Q