I think it depends on the room dimensions. When I bought my 2 Perlisten D12s subs, the dealer ran my (3) room dimensions through REW & it came up with having the front one a third in from the left wall & the rear one third in from the right wall at the back of the room.

I then, out of interest, put my room dimensions & detailed equipment listing into ChatGPT & it came up with the exact same placement suggestion, which I found to be amazing. It took it about a tenth of a second of course, and it knew all of my equipment, some of which is fairly specialised stuff. You can have an ongoing chat with the AI, telling it what settings you have & what you like / don't like about your bass.

Strange days indeed.

Cinema: Meridian 271, 3 x DSP640 (behind screen), 4 x DSP320 (in-ceiling), 4 x DSP3100 (surrounds), 2 x AC12 (interface). 2 x Perlisten D12s subs, Lyngdorf MP40 processor. DT 145" 2.35 AT screen. Sony VW870 projector & S-T lens, Lumagen Radiance Pro.
Lounge: Roon, NUC, Kef LS50 Wireless + 2 x REL Gibraltar-2 subs

Meridian owner since 1998