String inverters are generally designed to meet code without DC Balance of systems equipment between them and the DC string wiring. The exceptions are rapid shutdown and DC optimizer systems, or an inverter which hasn't caught up with the code cycle. It is usually not necessary to have a "pre-disconnect" before string inverter string fuses.
The fuse servicing requirement, requires that the fuses be capable of being replaced in a "touch safe" manner, after the inverter is shut off. Either by handling only non-metallic components (like rockout fuseholders or fuse pull-outs), or by disconnecting both sides of the fuse from energy sources on both sides (PV & inverter capacitors).
The place where you usually find this requirement affects your design as an EPC, is on a central inverter system with a fused subcombiner at the inverter. These fuses usually need to be unbolted to be replaced, which required separate disconnecting means on both sides (prior to the fuse, and after the recombiner busbar).