[NAME]  Happy to help.  USB-C to HDMI and DP to HDMI will not reduce image quality.  It's a pure digital to analog conversion, and nothing gets dropped, so as long as the original output, the cabling/adapters, and the display input you're using all support the setup you're trying to run, you won't encounter any image quality penalties.  But if you've got a 4K display, then you'll definitely want an active DP to HDMI cable or adapter, like this one, because although the DP output can run 4K 60 Hz in native DP mode and (at least in theory) supports Dual Mode DisplayPort to switch to native HDMI signaling to allow the use of passive adapters, I don't think it can switch to native HDMI 2.0.  You might find that the DP output can only run something like 1440p or even 1080p when using DP Alt Mode through a passive adapter.  But an active adapter allows the output to continue using native DP mode, so as long as the adapter itself supports 4K 60 Hz -- which the adapter I linked above does -- you'll be good to go.The only other thing on my mind is that NVIDIA G-Sync runs over DisplayPort and doesn't support HDMI, except for a variant that only works on certain newer GPUs and LG OLED TVs that appears to be a rebrand of HDMI VRR.  So if your display supports G-Sync, you'd want to use it through its DP input.  But that would require a different KVM in your case.  (Although if you need to go that route, I'd suggest the IOGear GCS1942, which supports two source systems and can share dual displays up to 4K 60 Hz each.)Hopefully this helps!
Hey there! I'm having trouble with my Dell WD19TB dock and an XPS 15  9500 hooked up to it. I recently purchased a HDMI KVM to share the same peripherals and monitor between a personal and work computer. When I use the HDMI port on the wd19tb the monitor doesn't work, blank and no hdmi signal detected it seems. I have to use a usbc to HDMI converter for it to work, I have no other monitor connected to the docking station or any of the laptop.  I know the dock has limited internal hardware and share hdmi and DP chipsets, but I'm only using HDMi so shouldn't it work? any particular setting I'm missing?
XPS with WD19TB dock and HDMI KVM switch