4 SSD - best editing performance configuration

Hoping to get some recommendations regarding hard drive configuration for best Premier Pro editing performance, specifically what (OS, software, media files, export files, scratch files, etc.) goes on what drive.

Drive info (4 drives)

C drive: M.2 Samsung 970 EVO Plus SSD plugged directly into the motherboard (1TB). From what I read, I want to instal Premiere Pro on this drive, right next to the OS (Windows 10)

D drive: M.2 Samsung 970 EVO Plus SSD plugged into expansion board (shared with drive E). The board is plugged directly in to the motherboard (1TB)

E drive: M.2 Samsung 970 EVO Plus SSD plugged into expansion board (as mentioned above shared with drive D). The board is plugged directly in to the motherboard (1TB)

F drive: Samsung SSD 860 EVO Internal SSD connected to the mother board via SATA cable (1TB)

Other hardware info:

Motherboard: ASUS ROG ZENITH EXTREME

CPU: AMD Ryzen Threadripper 2950X

RAM: G.SKILL TridentZ RGB Series 3200 64GB

GPU: ASUS  GF GTX 1070 Ti - 8 GB GDDR5

Thank you in advance.