DC isolators required between inverter and array

[Ant1_elect]

Hi, would anyone know if a single dc isolator (local to the inverter) is sufficient or would an additional dc isolator be required at the panels. The situation is an installation which has the dc cables from the panels routed through the property and clipped (8-10m run). All labels including 'live dc cable' along the route.
Are there any regs that point to this as a requirement?

 

[HES2019]

DC disconnector installed at the inverter and if the inverter is not in the same room or a fair distance from the string cables entering the loft, I would install another.