Thunderbolt Charging Dock for Precision 7510 IGZO (180W)

[Asanoth]

Hello,
I would like to get a 2nd hand Thunderbolt/USB-C (?) dock for Dell Precision 7510 IGZO. The power adapter has 180 W.
In terms of connectivity (I need 2x monitors and a couple of USBs), WD15 would be enough, but I'm not sure if it can handle charging as well. Thunderbolt 3 is said to be able to deliver 100W at most. The WD15 comes/came with an adapter up to 90, 130 and 180W, but given the 100W on the Thunderbolt, maybe it doesn't really matter?
Morevoer, there are also supposedly different models (WD15, TB15, TB16, WD15TB), which I have a little trouble getting my head around: Some are only USB-C, some are TB.
I'm considering a WD15-type as it costs around a 40 €, I won't buy a dock for for 180 or 300 €, that would not make sense for me given what it eases for me (I still have only 1 external screen, the other one being "maybe" in future).
I am not interested in an E-port dock.
Could you please advise me?
Thank you.