Practically - the GPU and how many RAMDACs it has

Modern GPUs, even integrated ought to have enough to support every display it has. Of course, it depends on 'how' the PC is designed, and how your system is set up.

minimum resolution of 1920x1080 pixels per screen (1080p)

Which sort of makes things easier, cause with the right ram setup, even a 7-8 year old low end system can power 2-3 displays of that resolution. My old 3050 can't play 4k video but it can output 4k with dual channel ram set up. There should be nothing in 2023 that can't output more than one FHD screen.

each screen requires graphics acceleration (to play video, perform 3D CAD manipulations, etc.)

That's a function of the GPU - you need at least one powerful enough. On multi GPU systems there may be ways to pick which GPU to run.

Also consider outputs - how many HDMI and DP (rare on laptops) ports you have, and more 'interestingly' - what your USB Ports are. Some laptops have USB C ports that act as DP out. If you have USB 4 or Thunderbolt 3/4 ports, you could use a dock that connects to more monitors or even a full desktop GPU in a dock. Some particularly adventurous folks also have use an onboard mini PCIe, m.2 or expresscard slot with a breakout box like the GDC Beast to run a desktop

You might also be able to use Multi Stream Transport enabled monitors in some setups to use one video out for many monitors. You'd need to check for support.

You probably could test these with the cheap 'dummy' HDMI dongles used for some headless streaming or bitcoin mining operations.

Practically - the GPU and how many RAMDACs it has

Modern GPUs, even integrated ought to have enough to support every display it has. Of course, it depends on 'how' the PC is designed, and how your system is set up.

minimum resolution of 1920x1080 pixels per screen (1080p)

Which sort of makes things easier, cause with the right ram setup, even a 7-8 year old low end system can power 2-3 displays of that resolution. My old 3050 can't play 4k video but it can output 4k with dual channel ram set up. There should be nothing in 2023 that can't output more than one FHD screen.

each screen requires graphics acceleration (to play video, perform 3D CAD manipulations, etc.)

That's a function of the GPU - you need at least one powerful enough. On multi GPU systems there may be ways to pick which GPU to run.

Also consider outputs - how many HDMI and DP (rare on laptops) ports you have, and more 'interestingly' - what your USB Ports are. Some laptops have USB C ports that act as DP out. I currently have a dock, that, for example will let me break out a video capable USB C port to 2 HDMI and a DP port.

If you have USB 4 or Thunderbolt 3/4 ports, you could use a dock that connects to more monitors or even a full desktop GPU in a dock. Some particularly adventurous folks also have use an onboard mini PCIe, m.2 or expresscard slot with a breakout box like the GDC Beast to run a desktop

You might also be able to use Multi Stream Transport enabled monitors in some setups to use one video out for many monitors. You'd need to check for support.

You probably could test the maximum supported video outs with the cheap 'dummy' HDMI dongles used for some headless streaming or bitcoin mining operations.