I don’t see where this can hold 4 PGMs
Could be a laser based weapon or some type of smart projectile based weapon.
For example, imagine a fleet of drones taking off from literally anywhere, landing 5-15 KM away from the enemy, then each unleashing a barrage of 3-6 projectiles towards the enemy target then taking off and flying away.
Basically high tech hit and run asymmetric warfare using the concept of VTOL hard to detect drones. By the time the enemy scrambles a counter response the drones are long gone.