I ordered three of these cables for my Tripp Lite brand KVM. I didn't realize I needed them until I ordered them (my fault) but I'm glad I did. You could probably just use VGA extension cables and some USB A/B cables, but I've read that a lot of people have problems with video cable shielding. I've used them and had no problems and they've also reduced the clutter on my desk.
CKL Quad Monitor HDMI KVM Switch 4 Port 4K@30Hz with Cables - Extended and Mirrored Display Support for Windows, Linux, and Mac
11 Review
NEWCARE HDMI KVM Switch: 4K@60Hz, 2x1 HDMI2.0 Ports + 3X USB KVM Ports - Share 2 Computers on UHD Monitor, with Wireless Keyboard and Mouse Support - USB Disk, Printer, USB Camera Compatible
10 Review
CKL 4 Port KVM Switch Dual Monitor DisplayPort 4K 60Hz: Unprecedented Multi-Computer Control with Audio, USB 2.0 HUBS, and DP 1.2
11 Review
4 Port USB 3.0 Switch Selector - Pubioh KVM Switch for Mouse, Keyboard, Printer, Scanner - 2 in 4 Out Sharing Box with Switch Button and 2 USB 3.0 A to A Cables
11 Review
Computer case AeroCool Cylon black
39 Review
Fractal Design Define R5 - ATX Mid Tower Computer Case - High Airflow and Silent Optimized - Includes 2x Dynamix GP-14 140mm Silent Fans - Water-Cooling Ready - Black
43 Review
Fractal Design Node 304 - Black - Mini Cube Compact Computer Case - Small Form Factor - Mini ITX β mITX - Enhanced Airflow - Modular Interior - Includes 3x Fractal Design Silent R2 120mm Fans - USB 3.0
42 Review
Zalman Z3 M ATX π» Tower Computer: A Compact and Powerful Machine
77 Review