Position Of Subs In Enclosure

So I've had someone tell me that a box for multiple subs needs no dividers or walls because the subs don't care. They are all occupying the same space regardless. So my question is this. If you have 3 subwoofers all inverted on the enclosure, but have 2 on say the bottom side in a spare tire cavity and one on the top side for mostly esthetic purpose is this ok without getting into the whole realm of higher order iso beric or band pass calculations?   I've built many boxes in my days but this is first time I've ever come to this scenario and figured I may as well see if anyone else had a suggestion, thoughts or knowledge in this scenario. I'm wanting to keep it somewhat simple. Just normal port and tuned enclosure math. I could do the more complicated stuff. Just really didn't want to have too.

Shouldn't be any issue. It's not the volume, per se, it's the wavelengths being produced. Walls. No walls. As long as your volume is correct, I've personally never noticed any detriment to a common cavity.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."