Here is a neat workstation case for 6 x 5.5″ Raspberry Pi displays. The 6-Display CyberDeck Case supports 3 RPi 4 units. You will be able to easily reach all the ports on your Raspberry Pi. You can also fit up to 3 x 26500mAh power banks.
The 3D printing files for this are available on Etsy. According to Sören Gebbert, the total print time is about 200 hours on a Prusa i3 MK3S printer.