Reddit reviews USB Power Cable - TOOGOO(R) High Speed USB 2.0 A Male to DC 4.0mm x 1.7mm Power Cable 3Ft Black
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Product Name : USB DC Power Cable;Plug Type : USB2.0 to DC 4.0 x 1.7mmCable Length(Approx.) : 92cm / 3ft;Material : Plastic, MetalColor : Black
Here is another suggestion that someone posted to Telegram. You could get a USB charging bank and USB cables to power the boards, and avoid the need for the surge protector and power adapters:
 
USB Charging Station
https://www.amazon.co.uk/dp/B072LNH59X
Needs to have output of 5V / 2.4A - 3.0A on each port. Also needs to have at least 100 watt total if running 8 boards.
 
USB Cables
https://www.amazon.co.uk/USB-Power-Cable-TOOGOO-Speed-Black/dp/B01FLRTR0A/
USB to 4.0mm x 1.7mm Power Cable
 
Note that I haven't tested this setup myself so just a suggestion to consider.
Depending on your future use of the Orange PI boards, it may make sense to house them in a stack instead of small box cases like I purchased, which do take up a lot of desk space.