TuringPi 2.5 setup question

I bought a TuringPi 2.5 during their Black Friday sale and while I'm waiting for it to arrive, I'm thinking about how I'm going to set it up.

I'm going to use 2 RK1 modules and 2 CM4 (CM5 if I can get them to work).

Does it make any difference which SoM goes in which slot? Is there a an optimal configuration?

I would appreciate it if you would share your experiences.

Thanks in advance.

Update:

I have decided to put a RPi CM5 in slots 1 & 2 (as soon as I can get my hands on then) and a RK1 in slots 3 & 4.

I'm curious if the CM5 is still restricted in terms of using the NVMe SSD.