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Looks like some people have had success using a Thunderbolt 3 hub for dual 4k monitors with your laptop.
https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T-series-Laptops/T480-DCH-Thunderbolt-driver-amp-TB3-Dock-Firmware-upgrade/m-p/4352681?page=1I'd have a think about whether one or two would be most useful to you. For example if you do presentations or virtual meetings with screen shares a lot then having separate monitors makes it easier just to share one and keep the other private.
Two 27'' monitors will take up a ton of space and you'll have to really turn your head to read from one screen to the next. I'd be tempted to go for an ultra wide monitor instead, something like the 35'' wide BenQ EX3501R. There's also no chance to lose your cursor between windows or bezel taking up space right in the middle. Not full 4k but good enough.
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Two 27'' monitors will take up a ton of space and you'll have to really turn your head to read from one screen to the next.
That's why I'd mount them vertically.
I've got 2 23" monitors (mounted horizontally) at the moment, so that's 40" wide (although they're in a slight V shape so probably 39" wide with 1" wasted on two 0.5" bezels) and 11.5" high and a total of 3840x1020.
Two vertical 27" 4K monitors would give me 4320x3840 at 23" high and 27" wide (so 26" in a slight V shape and adding a bit for bezels).
So less horizontal distance than currently, but twice the height. I was going to stick infrequently used windows (that I'd still like to reference) in the top half of the screens.
Thinking of upgrading monitors as WFH more.
Currently have 2 x 23" 1920x1080 on an Arctix Z2 clamped mount (which can take up to two 27" monitors).
Would dual 27" 4K monitors be massive overkill? I regularly wish I had more screen real estate than these current monitors, and a single 4K monitor would be 2 x the existing screens, so dual 4K would be 4 x existing.
Thinking of it in terms of 8 x 1920x1080 screens:-
Iiyama XU272UHSU-B1 is ~£280 on scan. Laptop (Lenovo T480) looks like it can handle dual 4K (one via USB-C, one via HDMI).
Or instead of two 4K monitors just buy one 43" 4K monitor (like the Phillips BDM4350UC) for £430?
(Don't need anything gaming spec.)