Actually, sacguy was talking about inline mults, not ones in the cab. In a small build like this, you have to optimize your space for maximum functionality (one of the huge reasons why small builds are VERY difficult to get right), and leaving the multiples OUT is one way to recover space. Instead of those, get some of the passive, inline type, such as what you see here: https://www.perfectcircuit.com/eurorack-modular-synths/splitters-hubs.html or some stackcables.
There's only a few reasons to have mult modules: having enough destinations for your pitch CV that you see "voltage sag" that affects tuning and/or scaling (and here, you'd need a BUFFERED mult, not a passive) is one. Another is because the build is large enough to have them without robbing space from functional modules. But beyond those, there's not a lot of solid arguments for them if you simply have a few of the inline ones on hand.