Lots of interesting thoughts and good suggestions from @HGsynth.

But be careful, you should not ideally exceed 640mA on +12V and on -12V (per each row) in a RackBrute 6U, that is to say 80% of the 800mA available (for +12V and the same for -12V, there are four separate circuits of 800mA in two rows): and this in order to leave enough headroom for voltage peaks!
However the data sheet of the rack proposed here (in MG) indicates 743mA on the row2 (for +12V), which would be very risky...

Also, you only have 12 slots in the row2, and I see here 13 modules.

'On ne devrait jamais quitter Montauban' (Fernand Naudin).
https://soundcloud.com/petrus-major/tracks