Dell D3818DW: How to connect KVM between PC and Macbook pro mid-2012? I just bought a Dell 38" Ultrawide (D3818DW) and I wanna get all the cables I need while I wait for it to arrive.
I want to use the KVM feature of this monitor between my MBP mid-2012 and my PC so I can switch seamlessly between them.

I've read that I need a Mini-Display Port to Display Port cable to connect my MBP. And to use the KVM feature, I have to also connect a USB downstream cable to the MBP.

However, I also read that connecting a MBP via USB-C can bypass having to connect a USB Downstream to use the KVM feature. My Mac has a Thunderbolt 2 port and two USB 3.0 ports.

So, can I just use something like the StarTech TBT3TBTADAP TB 3 to Legacy TB adapter for display and KVM? So I won't have to have two wires sticking out of my MBP when using the KVM feature.
No, that product cannot be used for this purpose as it does not transfer the actual display signal (i.e. what would be called Alternate Mode in USB-C), nor is it for connecting newer TB3/USB-C devices to an older computer - it is actually for connecting old TB/TB2-devices to a new TB3 computer.