I've been using this[0] kvm with a 4k 60hz HDR monitor. The only problem I have with it is the mouse and keyboard emulation doesn't work with my more exotic QMK keyboard mappings and the fancy features on my Logitech mouse, but I think that would be the case on any kvm.

Edit: whoops, missed that you're looking for DP. For what it's worth I'm using HDMI for all of the above with no performance issues.

[0] https://www.amazon.com/dp/B07CWR31PN/ref=cm_sw_r_cp_api_i_bS...