The Idea I have with VSL is the main computer does nead to be the most powerfull.
You can run Logic on your old MAC and use your faster MAC with the SSD as a slave. If you use MIR it is the best setup.
I use mainly VSL, and a few Kontakt, EXS and Omnisphere that I send as Audio tracks to MIR
To avoid to have Hundreds of track I use Program Changes to send keyswitches
I have no expericence with Windows slaves.
I use IAC and I have not tried the second version of the Multiport yet. VSL has not answered to my question 😔
I have just received my cables yesterday to set my 2 raids with 4 x ssd each, I think this is the direction to go ! I single fast computer with very quick disk acces
I will give you feed back next week as I dont want to touch my computer until after the saturday's rehersal I have with my band (we use Mainstage3 for the keyboards)
MacBook Pro M3 MAX 128 GB 8TB - 2 x 48" screen --- Logic Pro --- Mir Pro 3D --- Most of the VI libs, a few Synch... libs --- Quite a few Kontakt libs --- CS80 fanatic