Great news, I can confirm that the DELL XPS 8940 w/ GeForce RTX 3060 is now connected to three monitors (1HDMI, 2 DP) and driving all of them at 4K (3840 x 2160).  2 are running at 60hz, while the "main" display is running at 143hz.   I've also connected a wireless display (another PC running Windows 11) and it's display is also functioning correctly as part of the extended desktop. Happily, I didn't have to enable the onboard UHD Graphics card.  (The whole process was easier than I expected.  I haven't experienced any gotchas!)
I've purchased a DELL XPS 8940 Desktop which comes with GeForce RTX 3060 12GB GDDR6. The 3060 is advertised on Nvidia's website as having Multi Monitor support for up to 4 devices (3 DP 1.4a) and a “Maximum Digital Resolution” of 7680x4320. I want to combine this with 3 (4K capable) displays, but I know this card cannot drive 3 monitors at 4K given the max resolution constraint. I'm hoping the scenario below would be possible before I make a purchase decision of these 2 "portrait" oriented monitors. Can anyone here confirm what the highest resolution configuration be?  Would this work?    plus    plus Note: This DELL monitor should  automatically upscale any of its supported resolutions to fit the 27 inch full screen. I'm not sure how this works, but I don't expect (or want) to have any black bars wasting screen real-estate.
Take me to DELL Multi-monitor heaven!