Most people never consider such a layout. The two/three row and riser layout is pretty much the gold standard, but there's a lot of pluses
for a single row layout, if one starts to look at such a layout.
I would aim to take the extra width.
Salamander has some narrower seat designs, such as the Matteo.
I am exploring such a layout for myself, come a retirement move. That means I have no room to design around, so that means I need to
leave options open. I could see myself simply pairing up a pricey 4K pj and five commercial theater seats to make a narrower space work.
That would be a 10' seating arrangement. It'd also be pretty inexpensively cost-wise, but these days, I look at that as budget for some
other feature, like masking. On the very bottom end of seating, I could something like a single row JBL demo room (but in much darker fabrics).
On the upper end, it'd be more Waterfall Audio style if I wanted to invest budget in really good seating like Salamander .