Short and wide WAW help

I'm looking into making a WAW to use as desk speakers for my gaming PC. I have three monitors and the goal would be to have the speakers fit under my side monitors. Right now I have MTs laying on their sides, and they don't quite fit under the monitors, so they're more behind them, and it's okay...

My height constraint is about 6" but shorter would be better, maybe around 5.5". Width and depth are more forgiving. I'd say 16" wide and 12" deep, but I'd have to measure again and make sure.

Since all of the drivers have to be laid out horizontally, I like the idea of a WAW since I can run the full range down to 300-400Hz and have a woofer on each side of it without having lobing concerns. This should produce a favorable off-axis response in all directions, which is ideal since I'm not known for sitting still while at my desk. Maybe a max listening window of +/-20deg in all directions?

I've also looked at coaxials, but it seems on the budget end that a 3-4" full range will do better than budget coaxials. Which is sad, since I love coaxials. I use 15" PA coaxials for surrounds in my home theater. KEF makes nice coaxials but doesn't seem to sell the raw drivers anymore which is disappointing.

Another option is a combined mid-tweet like what Morel sells, but those are more expensive than full ranges as well and I don't think they'll do what I want...

I will have two subwoofers in the room as well so the speaker doesn't have to play THAT deep, but I'd like solid performance down to at least 80Hz to maintain some semblence of directionality.

So to sum up the constraints:
  • 5.5" max box height, width 16" and depth 12" should be fine
  • Woofer-FullRange-Woofer arrangement, with two discrete subwoofers
  • Crossover will be active, with ideal points of 300-400Hz to the fullrange and 60-80Hz for the sub
  • Max off-axis angle of 20deg, but it's variable
I like the look of the 10F/8414G10 as the full range, but they're expensive and hard to find. I have two on order from Ebay, but they won't ship till September potentially... Another option is the Peerless TC9FD as used here: https://www.diyaudio.com/community/...-waw-ref-monitor.273524/page-188#post-7077022

For the woofers I was looking at Peerless SDS 5.25" woofers since they have the flat sides which will help limit height.

Any other driver recommendations or ideas would be appreciated! Unfortunately ditching the three monitors to allow a more "normal" speaker is not a good option here...
 
I have enough space on top of the desk to fit a woofer. So I'd want to keep it and the FR in the same box if I can. Then have just the subwoofers under the desk.

Ebay seller won't cancel my order on the 10F/8414g10 so I guess I'm locked in on that haha. So now I just need to find woofers I like. A friend of mine recommended I run one or two HiVi L5-8R. They're inexpensive and will fit on the baffle size I want.

I'll probably run these active too since I'll have enough channels on my DSP and have some spare amps.