The main issue with bi-fold doors is their weight and the way the hinges operate. I haven’t built bi-fold doors for any recent projects, so I don’t have any current hardware recommendations.
In the past, we used piano hinges, but that’s not a feasible option today—they offer no adjustability and no spring mechanism to keep the doors closed, so I wouldn’t recommend them.
Blum does make a bi-fold hinge for a base 90° cabinet, but it won’t work in your case since it requires the doors to rest at 90°, not at 0° (flat), as you’re requesting. I reviewed their catalog and unfortunately couldn’t find any hardware suitable for your application.