Thanks for posting!
The key question that I need to understand from you to best provide a potential Plugable solution is what kind of future systems you will be considering. You mention that you can’t guarantee a USB-C port will be on your next computer, however USB-C is growing more prevalent along with Thunderbolt 3, so there is a bit of a conflict there. Compatible USB-C and Thunderbolt 3 ports come with huge benefits over the typical USB 3.0 Type-A port, which you might be interested in taking advantage of especially in a new system.
I’ll proceed assuming USB-C is out of the picture, but let me know if you might reconsider there.
We don’t offer any single quadruple display docking stations, but what we generally recommend to customers looking to achieve four displays is the use of one of our USB 3.0 docking stations in combination with two of our USB 3.0 graphics adapters.
I would recommend either versions of our USB 3.0 Dual Display Docking Stations (UD-3900 or UD-3900H).
Both of these docking stations can drive up to two 1080p displays via one HDMI port and one DVI port (or VGA with the included DVI-to-VGA adapter). Additionally, they provide gigabit Ethernet connectivity as well as a total of six USB ports (two USB 3.0 ports, four USB 2.0 ports). The main difference between the two is their form factor (horizontal versus vertical) as well as the port placements. Please see their product pages for more information and feel free to choose the one you might prefer:
-Plugable USB 3.0 UD-3900 Dual Display Universal Docking Station: https://plugable.com/products/ud-3900
-Plugable USB 3.0 UD-3900H Dual Monitor Horizontal Docking Station: https://plugable.com/products/ud-3900h/
Next, you’ll want two of our USB 3.0 graphics adapters (UGA-3000). These simply connects the USB 3.0 ports on the dock, then to your monitor via HDMI, DVI or VGA. Please see its product page below:
-Plugable USB 3.0 HDMI/DVI/VGA Graphics Adapter: https://plugable.com/products/uga-3000
If this is something that might be of interest to you, I would first recommend ensuring that the DisplayLink driver for these display devices are compatible with your system by referring to DisplayLink’s system compatibility checker tool: https://support.displaylink.com/knowledgebase/articles/544297-is-my-windows-computer-compatible-with-displaylink
I hope this helps!