What are the options for the "iron" implementation of remote administration?

Question

System administration

Advise please a piece of iron under the task described below. For a number of reasons, software solutions are not considered.
There is a workstation with 3 fullhd monitors.
It is necessary to organize the possibility for some employees (at least 4 people) to connect from their workplace to this workstation. At the station itself, the image should not disappear at the same time.
Ideally, the remote user should see all 3 monitors, but one is enough if there are no problems with the mouse "going" to 2 other monitors.
The resolution of the remote monitor or the original fullhd or competent scaling (so that again there would be no problems with mouse synchronization).
Image quality - to read the text.
It's good if the hardware has a built-in VNC or a similar server.
Of the tested - IP KVM Aten CS1708i Its
maximum resolution is 1600x1200. Due to the difference in permissions, the mouse is out of sync, and when you try to synchronize, the mouse "leaves" to the adjacent screen and generally ceases to be seen by remote users.
UPD. All action takes place on the local network. Access to the big world is not needed.

Answer 1

Isn't it easier to just make RDP even for 100 employees? Instead of IP KVM, put a small gate with VPN (cisco, mikrotik) and access only to the necessary hardware and you're done. Same implementation of IP KVM, only more scalable and flexible in terms of security and connectivity

Answer 2

Well, put VNC directly on this workstation, what's the problem?

Answer 3

1. Perhaps this class of devices "VGA / DVI / HDMI over Ethernet / IP" will help, for example here: www.startech.com/AV
2. Look at Intel vPro technology, I really doubt that 3 monitors will pull, but one is for sure .
3. There is an option to provide a picture to both the remote user and the local one using the standard screw RDP. You don't need to install anything extra.